Have you tried preparing him ahead of time for something new? My nephew does this when he tries something new, my sil starts preparing him weeks before a new activity. For example, he started t-ball a few weeks ago, back in jan-feb she started telling him that he would play in the spring, pointing out pictures of baseball/t-ball, reading books, things like that. By the time spring came, he was talking about how he was going to play baseball and was excited about it. It might be worth a shot at least, HTH!
Chelsea SAHM to ASD Nate 1-07, preemie peanut Emma Lynn 7-08, Clara Elizabeth 2-10 and Jonathan Connor 10-11 Wife to highschool sweetheart Z