I would suggest taking it to an alignment shop and have them put it on the machine and try to figure out how bad the damage is. They should be able to advise you whether it is safe to continue driving or not. It will probably start eating front tires if you do keep driving it. Keep a close eye on the tire wear accross the tire.
From here it does not sound good. Upper/lower control arms come to mind if you are lucky, frame issues come to mind if you are not. I would call my insurance company (if you carry full coverage) to get them involved. If it is frame damage you want to try to get them to cover it.