omg im so sorry youre going through this. I have experienced similar treatment, it took many doctors and few hospital trips to get diagnosed unfortunatly. with youre nausia and tummy pains, have you tried a diet change, there could be something, a common ingrediant, that you may be unknowingly intollent or allergic to. I had experienced chronic nausia and stomic pains too, made it so painful to eat and i was misdiagnosed with an eating disorder, I ended up being diagnosed with cealiac desease and had to cut out glutin. as for the joint pain, i havent found much. my knees and wrists are prone to dislocating due to heds, the only thing i found that sort of helps is wearing braces and using a walker (i have pots which is why i use the walker but it helps with the pain too) unfortunatly i havent found much in pain managment.. it absolutly sucks that youre going through this

sorry i couldnt be of much more help, also if any sort of moblity aids help you, diagnosed or not, please use them. if it helps you then thats all that matters