Hello, My Story Starts About Two Months Ago. From Age

Hello, my story starts about two months ago. From age 17 to age 21 I smoked marijuana heavily every day, I stopped cold turkey for almost two years until two months ago I started smoking heavily again. A month into my smoking I started having what I believe to be anxiety. One evening after dinner suddenly my chest hurt, my arm went numb, I had heart palpitations, negitive thoughts, and I seemed to go pale. I went to the ER thinking it was something serious. I had an EKG and blood work to test my organs and nothing was found. I went home still feeling anxious. I felt this way for a few days and it was a nightmare. I kept thinking something was wrong with me that they over looked. I set up an appointment with a quick care office and they couldn't tell me anything either and I was givin a script for Xanax and sent home. I took one and it seemed to take the edge off but I still felt horrible. I scheduled another appointment with a clinic and was giving a physical, EKG and more blood work. Nothing was found, and the doctor suggested I see a therapist. For the past month I haven't smoked pot and when I started feeling anxious walking around the neighborhood really helps. I stopped smoking marijuana, I felt normal for a few weeks until a couple days ago I had a very strange feeling of deju vu. I felt like events were happening that I experienced in a dream or in real life were happening and that sent me into the anxiety with the palpitations. The intensity went away after a few hours but for the past few days I have felt strange, with negative thoughts and a slight haziness I'm able to function socialably and physical if I need to but I'm still slightly uncomfortable. I thought it was my dive back into marijuana that set all this off but I'm not sure now after this deju vu experience because A few months ago before I even smoked I got that intense deju vu feeling at work and had to go home. My chest hurt during this and my family suggested I go to the ER. They ran the EKG test and blood work on me then and found nothing. I went home and felt normal. I don't know what to think of all this, I don't want to live in fear that something is wrong with me. If anyone has any medical advice please let me know. I'm 24 305 5'10 Caucasian. Thank you.