what type of splint were you wearing? what other treatments have you done? what are your symptoms?
if you dont have the money for an adjustment, i'd try to see if you could work out a plan with your dentist - who knows, maybe he'll do an adjustment for free.
were you having problems with the splint when you stopped? because if you werent having increased pain or symptoms with it, my suggestion would be to try it again. i guess if you get worse, stop wearing it, and definitely try to get it adjusted.