What Causes Persistent Night Sweats And Fatigue?

im feeling tired all the time and having night sweats and I have a headache most times and at times I cant sleep .. everytime I try to sleep I just lay thr for fours... I also have 3 ulsers but the doctor said that I don t really need the antibiotics cuz it loos eally clean... and I found blood in my pee today... my stoach hurts and sore bak all the time ... I m in a wheelchair and bound by it.. I had my leg amputated last year but on my right foot never heal sinse 2013 of febuary...... I try to have it clean all the time but I developed new wounds on the same foot and I m worried about it.. and something is wring with me and I feel that thr is something wrong but the doc says thr is nothing wrong but never had tests done not even blood work ... I don t know how many times I have to go to the hospital to get cheked but they always send me home telling me nothing is wrong.... now I feel very tired all the time and getting bed sweats , having headaches and sore leg.