Well, it seems as if he just needed one more day! I asked my trainer to lunge him while I was at work yesterday, so I could attempt to get on him again. She lunged him in side reins and he only let out one little buck going to the right (not really unusual for him). By the time I got to the barn, he was showing signs of his normal personality, actually acted happy to see me, and was a joy to ride! I put him in a martingale for the first time last night, which he wasn't particularly happy about, but he wasn't spooking, or trying to run away with me! Yay! I'm starting to see signs of my sweet boy coming back! We're going to attempt a lesson on Saturday so I'm keeping my fingers crossed that he's settling in and learning that there are no monsters at the new farm.
Thanks everyone for the suggestions! I was getting a little worried yesterday!