Horse suddenly refuses grain

Shut up with the bots - I had enough of the last lot of worms you had me creeped out with!!!!
If the horse is eating other stuff then its mouth must be feeling easier, he might associate his own feed with pain or it could just be that you have somehow got a bag of contaminated feed - it can happen
I have had horses with really sore mouths from injuries - my old mare even managed to bite her own tongue really badly but she they stopped eating even if they did make a mucky mess of trying!!!

*feverishly digging up more info on parasites*.....

You do know there's a name for people like you don't you? I havent thought of it yet but I'm sure I will
I couldnt face rice for weeks after the last thing and I'm still not sure I havent caught them!!!

Lol....poor thing. You're too visual........
Cat tape worm won't survive people....nothing to worry about. And when you see the rice, it's already dead or dying. Watch for fleas, tho. They carry the tapeworm eggs. Don't eat fleas

Dewormer is a good idea. Flies are awful around here. Caused me lots of Vet bills, in thier eyes crawled under a fly mask somehow, and the sheath , habronema's .. Karo syrup on feed.. horses Love it. Just a small squirt adds flavor and they slurp it up. Even the skinny old brood mare who Just knows that we are poisoning her with additives .LOL.. she detest any substance on her feed but karo syrup helps hide the bute taste and smell , for when she needs it. Also, try teasing her with the supplements, leave it just outside her pen , where she cannot reach it, but give the neighboring horse its feed. So she will Want hers.

Ulcers could be present. Never know. These old horses like to make us THINK they're senile lol

You could always try treating with cheap ranitidine from your local Walmart. If symptoms subside, the. You have a pretty good idea that ulcers are present.

If that's the case, you can continue to treat with the ranitidine (pain in the butt, but much cheaper), or you can go with the actual equine ulcer meds (ulcer guard).
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Have you tried to feed out of a different bucket? Maybe there's a smell or taste coming from her feed pan.

Thank you everyone for all the help. I bought a different brand senior feed and mixed it 50/50 with what I have and she is happily gobbling it up again. I think she had an aversion to it because I was adding meds while she wasnt feeling well... either associating it with the taste of the meds or the pain she was in. She is back to herself again. Merry Christmas all!