Where is your pain? Look up the tender pressure points for Fibro. It sounds like FM to me. I have had it for 12 years. I would describe it as feeling like you're body is buried in wet sand... that's what it feels like to move. Exhaustion has always been my worst symptom. Nothing has ever helped... except massage. Best Wishes.
My main symptoms are exhaustion, flu-like aches and pain, my skin hurts to touch, typical FMS tender points, and fibro fog. I try to avoid excess stress, foods like cause inflammation (white bread, etc), excess white sugar and food additives. I, also, try to get good quality sleep, eat the four main foods groups in appropriate quantities and drink plenty of water. (Be sure that your sleep isn't being poorly affected by caffeine, snoring, or restless leg syndrome.) It hasn't cured me but I have been having less "episodes".
A "foggy" brain can be caused by different things, be sure to talk to your doctor.