What could this be? Pain, double vision, etc.

I am trying to figure out what to do next.  I have been seeing flashing lights and double vision for a few years.  Now though, I have a lot of pain.. and I don't know what the cause is.  My hands, feet, and ankles burn!  It usually affects one side at a time.. the past week the left side of my neck to my left fingers and been hurting a lot.. today it was the same with my right.  My pelvis has been hurting for the past few months too.. with a bladder infection almost every month.  My left ear hurts, but I have no infection or wax buildup.  I feel dizzy and very tired.. and I have been taking tylenol or ibuprofin around the clock every day for the past week, when the pain started getting very bad.  I had blood and urine tested.. no RA, no lupus, thyroid neg, and everything is normal.  I feel like I'm going crazy.. could all this just be in my head?  I feel so guilty about it, and I bother everyone.  It just hurts so much, and nothing seems to fix me.  Thanks.  Btw, I am 26 years old, and I have a small child.