You fed the snake wayyyyyy too soon after getting him. They need an acclimation period when you first bring them home and I would wait at least aweek before trying to feed it. Also, the temps sound a little low, I would try to raise the warm side to about 86 or so. If it is too cold, they will regurge, and from stress as well. Also, check out corallus.com, it is by far the best resource on tree boas on the net.