I've been experiencing headaches typically in the back right side of my head, but lately, I've been having pain in both my ears, where my neck meets my head and generally all around my head. I've also been experiencing lightheadedness occasionally. I went to Urgent Care two weeks ago and they sent me to the ER for a heart rate in the 130-140 range. They did a chest x-ray and a blood test but they couldn't figure out what was wrong. Last week I went to my primary care provider, where they did a routine physical exam and they said it was most likely a side effect from the medication I'm taking. So I stopped taking the medication and the symptoms haven't gone away, they've seemed to even get worse? I've also been experiencing nausea every once in a while. I know it's irrational but I'm worried about a tumor or something else serious. The headaches aren't getting better with Advil or Tylenol and are starting to interfere with my daily life. Any ideas as to what it could be?