Why Do I Experience Intense Pain, Fatigue, and Fever?

Last year, I got sick pretty bad. It started with migraine like headaches then intense body pain and severe back and neck pain. It was followed by fatigue, muscle stiffness and dizziness. No amount of painkillers relieved the pain. I couldn't even walk properly, someone had to hold me to get through hospitals. I got several tests done including MRI, EEG, B12, vitamin tests, eye tests, CBC and X ray for my back. There were a few vitamin deficiencies but they shouldn't have caused that much pain according to the doctors, MRI was pretty much normal. There were few abnormalities with my XRay in spine but again they were mild and not severe enough to cause me such intense pain. I took medication or migraine, some medication to make my nerves strong and I think some anxiety meds because they suspected GAD (all were prescribed by doctors). Most physicians suggested I go to a psychologist and the psychologist referred me back to physicians and I went back and forth. I got better after bed rest but I had to go back to college because I was missing on my studies. But I fell sick again, cramps like pain, consistent fever but on and off. I got tested for typhoid and other things but absolutely nothing. Then I went to a neuropsychiatrist who told me I had fibromyalgia, it aligned pretty well since I always had memory gaps as well and I've been concerned about it for a while. The medication he gave me worked, I for the first time in months started feeling better but as time passed by, it stopped working for me. I couldn't continue the medication due to expenses as well. So, I've been in pain ever since. When I've had a tiring day the pain is bad, when I am stressed it's worse. Every morning I wake up with pain and every night I go to bed in pain cuz it's worse in the mornings and night. If I rest too much, that's painful and if I don't that's painful too. Fever also shoots up every now and then. My body is in pain and exhausted, everything is difficult, walking up or down the stairs. Although some days it's better but other days it's difficult to even move, painkillers do absolutely nothing. I don't know what to do anymore