Need advice

So sorry if this post comes off a little all over the place, I'm a little frazzled right now. Ever since middle school I've had bad knees, they dislocate constantly but always pop back in place. In 25 now and once again my left knee has dislocated, when I fell this time I heard my back crack and now I'm radiating pain but at least can still walk/stand. I have a few other health problems so my medical bill's from this year are already too much for me to see a doctor about this fall. I need advice on what to do at home to help my back and knee. Also if there could be a deeper issue as to why my knees are garbage. Any help is appreciated and again sorry if I'm all over the place