Struggling with Health Issues and Financial Troubles

Context: I don’t have a diagnosis. I’m 21, straight of of graduating with my bachelors and living with my parents. We have financial troubles. I’ve had lupus, endometriosis, and other symptoms since I was a kid but doctors seem to dismiss me a lot. I got a job at a summer camp for 3 months where I’d be teaching art. I was excited and packed meticulously. Once I got up there the next day I woke up stiff and swollen. I would come to have my fingers, wrists and especially my ankles swell up 2x the size. My lymph nodes swell up, I’d get a headache every time I walked outside (which I expected in the sun anyway), my lip swell up 2x the size with cold sores and my whole chin area hurt extremely bad. I got stomach problems, nausea, and chronic pain flair ups. My house is normally around 780 ft elevation, though I lived for a year in 350 ft recently, this place was 3,000 ft elevation. 3 questions: 1. Has elevation ever effected any of you? The night I came home I woke up to my joints feeling better and by the second night they were back to normal. My teeth hurt when I got back oddly and took a few days to get better. 2. What do I do? I want to look for answers. I need diagnosis for people to take my seriously. Is it a thing to get short term disability to find out what’s wrong with me? 3. My dad said some hurtful things, that I didn’t prepare enough for camp. That I should’ve gone outside and exercised. I need to start sucking it up and pushing through things. As if I didn’t wait until my the 5th day of pain to voice my health concerns to my boss…. Advice is needed. I need emotional support and solid advice on how to get through this. I have dreams. I want to go to graduate school. I don’t want my health to screw up my life more than it already has.