The fact that your symptoms are all over the board (dizziness, abdominal pain, rashes, shortness of breath) really makes me feel like it is anxiety. I was convinced I had either a brain tumor or MS last summer due to dizziness, derealization, tingling, eye floaters, and finally had an MRI done and everything was perfect. Didn't convince me, since I knew that MRIs can miss TINY tumors and MS lesions, so I continued spending money going to neurologists, eye doctors etc. It wasn't until I quit my job and got a new one that my symptoms went away. Unfortunately, the problem with health anxiety is it manifests itself differently every time. I have had stomach pains for over a month now ,as well as acid reflux, nausea, lack of appetite. I am convinced something is horribly wrong as medicine isn't helping, yet doctors are not concerned. We have to remind ourselves that they go to YEARS OF INTENSE MEDICAL SCHOOL to learn what they know and ten minutes of googling IS NOT EQUIVALENT to this knowledge. I work in retail, I am not a doctor. I have been taking fluoxetine for three weeks now and it has not helped, still sort of waiting for it to 'kick in', in the meantime trying to hold it together ( I had to leave work yesterday from a panic attack). You say you don't feel stressed or anxious but you obviously ARE, that anxiety over the symptoms just feeds the symptoms and it is a horrible loop. If you had a brain tumor for three months without being diagnosed you would be dead. My roommate has lupus, and her blood work was always WAY off to the point they knew something was wrong. She lives a perfectly normal life btw, just gets tired once every few months, which compared to me makes her seem in perfect health! Looking in the optic nerve is a VERY good indicator for MS, as visual symptoms are usually the first manifestation of the disease. I also get rashes and burning when I am stressed, my whole face breaks out and my skin is itchy and tingly. The fact that doctors don't want to do a scan is a good thing! Scans give you unnecessary levels of radiation that can do more harm than good to a healthy person. We really need to get through this horrible time, I hope some of that helped.