Pain during sex and weird discharge?

Sorry if this is a TMI but I really need this answered as I can't get to the doctor for awhile. The last few nights I've had an abnormal amount of discharge and it's think and white. While having sex it felt like my boyfriend was hitting my uterus big time but this has never happened before, it was very tender. It caused me to tighten up a lot and dry out and it burned on the inside. Afterwards my discharge was dried on my boyfriend and you could see it, it was gross. I've also noticed a slight smell. It's very upsetting because I'm a VERY clean person. Any ideas as to what it might be? And how to treat it at home?