Burning skin

For the last 10 months I've been dealing with a burning/hot/irritated feeling on my pubis area. The skin looks normal, no rash. It's constant and excruciating. I've seen 5 Dr's including two dermatologists. None of the Dr's have any idea what it is from. The only suggestions they have are possibly nerve pain or anxiety but I don't think this is from either. A little background--my husband and I have been ttc for 2 years and I'm currently taking metformin, Letrazole and cortisone. None of the Dr's seem to think it could be a side effect of the medications. I'm out of options and desperate to get rid of this feeling. If anyone has any advice or suggestions or similar situations please share.