I hope that by now you have called your vet. Your pony could very well be colicy and that can be a life-or-death situation.
Anytime you see continual odd behavior, call your vet. You can discuss the situation with him over the phone to determine if it's something that can wait or that you can take care of yourself or if your vet needs to come out immediately.
Please read these 2 articles so that you can be better prepared to know if your horse is colicy and to understand what to do and how serious it can be. http://www.extension.umn.edu/horse/c...eets/colic.htm http://osuextra.okstate.edu/pdfs/F-3921web.pdf