I have no credentials, but I would say you have say you may have some PSTD as well as depression. I think you have a lot of deep issues trying to surface. I would think therapy might be a good idea to help you with the stress you are under. Caring for elderly parents is hard. I've been through that and it is not easy. I don't know about all the other possible diagnosis, as a I said I'm just another non educated soul. Take what you like and leave the rest.