I was awoken immediately in deep sleep by an urge to vomit. I woke up and the urge became worse, but I can't vomit. I have a severe burning sensation in my throat, very acidic taste in my mouth, saliva, etc. I tried drinking some water and it made it worse. It is now subsiding a little after roughly 15 mins. Is this a super bad case of indigestion? I did have corn chips and salsa 2 hrs before bedtime, but I've done that before.