The pain is BACK! The pain in my mid back left side is back. It started on New Years eve and hasn't gotten better yet. Thought it was because I had too much to eat and Im also on Amoxicillin for a toothache but it's not getting better. I feel it when I move. It hurts when I lie down . I swear i can feel it when I swallow too. I was hoping it was acid reflux but I have no burning and nexium is not helping