However, Day 4, we are back on track!
Since he got sick, there's been a dramatic change in his personality (which is why I think I got the "finger" when I actually worked him on Saturday for the first time in awhile- he's generally just seems much more comfortable, so I figure he was testing his limits).
I have been handleing him, and just generally being "nice" to him since he's been sick- grooming, walking (he and the others). Not exactly cuddly, per say, but any work that brought respiration up was a no no. He can't stand the other gelding still, but I don't blame him. That gelding is very annoying, but he likes the company of my mare.
He also decided to break into MY HOUSE... opened my gate, up the steps, on the porch, and straight in through the front door (door was open, was a nice day, I was letting things air out). I came home (I was at neighbors) and found a very, very messy house with a throughly pleased-with-himself horse in my kitchen.
(I didn't think of pictures until after I got him out and was cleaning up)
Day 2, there was initial attitude at working, but he quickly got over it and went about his day. Day 3, he said "ok, this is what we are doing now" and we just picked up where we left off. Day 4 (today) I ponied him around him my mare and we walked/trotted around the property (after going a bit in the round pen, but- the round pen is incredibly boring, and neither one likes it in there so I try to keep it at a minimum). He did awesome! He doesn't exactly know how to monitor his pace (either too fast or too slow) but that'll come around. I just decided to pony to change things up a bit, give him new perspective.
Thank you all for your suggestions!