My ball python fell a short distance and I believe he hit a corner of some wood. He's acting a little strange, but I am a relatively new owner and am wondering what behaviors I should look for, and if I should take him to the vet? (I am very low income right now.... And it is very expensive.)

I didn't feel any defining bumps, but he is lying stretched out and won't go in his hide. He is 'staring into space' but he does that a bit normally... There are not cuts. He just seems to be odd.

Any notes on behavior and what is a signal to get him help would be greatly appreciated.... I love him so much...