I'm sorry you're going through this.

What meds are you on? Have you googled them to see if the rash and mouth sores might be side-effects? I was put on Atenolol for hand tremors and developed eczema across both sides of my lower face that went away when I went off it. I also developed several cankers at one time years ago from some birth control pills. Might be something to investigate until you can get to your doctor.....