Anyone ever experience this problem while riding?

The one thing I noticed that you didn't say you've checked is her teeth... dental issues may cause severe behavioral issues that, if left unchecked/treated, can take a lot of time, patience and money to train out of them...
Not to mention, it can be extremely painful for your horse. I witnessed a really beautiful, kind hearted mare being "ruined" once because her rider didn't know enough to check her teeth (good rider, lack of knowledge on horse care). The rider eventually sold the horse after taking care of the dental issues because they (the young rider) lacked the training experience and patience to now "retrain" the horse who'd developed nasty habits (that stemmed from trying to tell her rider "OUCH! THAT HURTS! STOP IT! HELP ME!")... the horse progressed from head tossing to bucking :/

Teeth, poll, or could be your curb chain is too tight if you use one, or that your hands are quiet and soft, or too high, also you might check your seat as if you are a bouncy rider, that will irritate horses too.

I Know a lady who had a barrle horse that would go into head throwing fits. Didnt matter if she was barreling or trail loofing. She changed bits, that didint help. She had her teeth checked, that didnt work either. Finally a vet pinned it. Her horse got headaches! She got her "horse tylonol" and she was fine.

I was talking to my bf earlier who mentioned one of the horses he occasionally rides throws it's head so badly it could knock you out and managed to catch his nose once. I think they changed her bit but it was more to help stop her than the head throwing thing, some horses just do it :/ (shes an extreamly strong horse and if she spooks or bolts even advanced riders struggle with stopping her)

Same problem here...got my 14 year old a quarter horse a couple of weeks ago...she's experienced, been taking lessons since was 6, rides in local shows, etc...he was trained at the Charlie Daniels ranch but hadn't been ridden for about 3 years and we are told the first owners weren't very nice to him...over all tho he's really good boy, well behaved...that said he hates the bit but is very responsive w/out heavy reins so we got him a hackmore which eliminated the "thrashing back and forth but in a full cantor he throws his head straight down...good with walking, trotting etc..just cantoring...he's really quick and we haven't taken him out of the enclosure yet vs the pasture....he seems to do this in turns..anyone think it's possible he's looking down b'c the space is small relatively speaking...about 200 x 30 feet and he's running so fast? Many thanks from S.C.!

You're welcome. For anyone else with this problem, once you feel you are truly aligned side to side check the position of your hip bones to see if one is leading the other which puts one shoulder ahead of the other. When you get both corrected you are now at least momentarily in balance with the horse. If one rides daily it takes about a month of conscious effort before it becomes unconscious and muscle memory takes over.

Midnight, when he takes off like this don't fight him, just let him go altho do steer him a little in the corners so he doesn't suddenly slam on the binders. When you feel him tiring that is the time to urge him on. Keep going until he's puffing hard. You'll feel his body wanting to slow down. When you think he's had enough relax your body like a sack of potatoes and barely pick up the reins. Don't take the slack out as your body is telling him to slow. He'll be so glad to stop, grab some leather behind you as he may do a big stop. When he has stopped, walk him around either in the saddle or afoot for 10 min to prevent lactic acid from building up in his muscles.

QUOTE=Saddlebag;1910539]Midnight, when he takes off like this don't fight him, just let him go altho do steer him a little in the corners so he doesn't suddenly slam on the binders. When you feel him tiring that is the time to urge him on. Keep going until he's puffing hard. You'll feel his body wanting to slow down. When you think he's had enough relax your body like a sack of potatoes and barely pick up the reins. Don't take the slack out as your body is telling him to slow. He'll be so glad to stop, grab some leather behind you as he may do a big stop. When he has stopped, walk him around either in the saddle or afoot for 10 min to prevent lactic acid from building up in his muscles.[/QUOTE]

*Thanks so much...really appreciate that we will try this later this afternoon!

Photic headshaking? I ride a gelding who is one, it's very severe in summer, poor boy. The special fly veils and chiro sessions helped a lot.

Good luck with it.
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I would get the chiro out, if it were me. I know for my younger mare if she tosses her head/acts like an imported giraffe in any way it's time for the chiro. Any number of things could be out, and may have been out for a while.

That being said, my pony does this, though it is behavioral and generally does this when she's wanting to do a "take off and flail aimlessly" sort of move. Something tells me that's not what your horse is up to =p