Hey Stephanie, welcome to HealingWell. Sorry you are having so many problems; sounds pretty rough for you right now. I do have some advice, though, that may help you weather the storm of your illness. It is good that all your tests have come back normal, even though that doesn't mean you don't feel cruddy.
First of all: start a journal. You will write in this every day - what you eat, in detail (amounts, too); any symptoms you have (how many BMs, pain, etc.); your weight (only weigh yourself once a week); and your mood. You have to be really introspective to determine your mood adequately! You might start finding a pattern that wouldn't be apparent otherwise.
Fever is a tricky thing - are you taking your temperature every night? A fever is defined as 99.5 degrees or above. You might find that you feel feverish even if you don't have a fever, or that your temperature of 99.2 or whatever might just be a normal variation in your body temperature (which can go from 97-99.5 depending on the time of day).
As far as food goes, you really need to eat. The reason you have loss of appetite is because you are not eating enough. Sounds weird, but it's true. Food will give you energy, and that will help your body heal. You'll want to eliminate the apple sauce and juice - this can cause diarrhea and cramping in people with sensitive stomachs. Ensure is good, but also eat things like plain baked potatoes, soups, etc.
If you were on Paxil in the past and it helped, you should go back on it. You are living with your mother who has a difficult chronic illness herself and even if you don't "feel" stressed emotionally, it is a stressful situation. Do you have a good support network of friends/family? That is very important in your situation.
If your doctor is not paying attention to your pain, you might want to try another physician or a nurse practitioner. Have you heard of osteopathic medicine? D.O.s are equivalent to M.D.s (same length/content of medical education, with added musculoskeletal emphasis) and they are trained to look at the body systems as truly integrated, not independentally functional. There are some neat techniques they have to alleviate pain. Or you could call a local pain clinic to see if they may be able to help you.