What Causes Nausea And Diarrhea Along With Dizziness And Palpitations?

Over the past two weeks I’ve been experiencing progressively worse symptoms. I have been to the emergency room twice and all results were normal. I am experiencing nausea and diarrhea, dizziness, neck and shoulder pressure, anxiety, heart palpitations, tremors and excessive sweating. I have a history of lupus and a blood clotting disorder and when in the emergency room all blood work came back OK. I do have a history of panic and anxiety and did a medically managed detox off of Xanax. This was nine months ago and I am currently and have been off of all my medications. I’ve been to my primary care physician as well and was told all results looked OK. Every day this is getting progressively worse and nothing improves this. During the first week lying down would help but now that is no longer the case. Standing up and walking around makes me extremely dizzy and faint. At this point I’m at a loss of what this could be and don’t want to go back to my doctor or the ER as they just told me nothings wrong. I did stop taking Tylenol p.m. last Friday after a prolonged usage. Other than the Tylenol p.m. I have not taken any meds since completing my detox. Any help you can offer would be greatly appreciated.