I have recently developed several symptoms that I'm not sure are related. They did all show up at about the same time. I've experienced skin rashes (sometimes painful and/or itchy... Sometimes not.) I have several painful spots in my mouth and I have had a black coating on my tongue a few times. I have also been having heartburn and nausea. I really got concerned when I started belching constantly since I have never belched in my life.... even when I tried to! LOL! My worst rash at the moment is between my eyebrows and on my eyelids. It is causing some uncomfortable swelling above my eyes. I am also having swelling in my neck/throat that is not painful but makes it difficult to move my head. Any thoughts?