Suggest Treatment For Twitching Sensation Across The Chest

Hi, I have experienced a twitching like condition across my chest, left and right sides as well as my back. Not necessarily painful but noticeable. I also have had a pain that came and went in my left arm. The twitching has been happening for about three months. While on vacation about 3 weeks after the issue started it seemed to stop for 9 out of 10 days. Upon return to work it returned worse than before. I ended up going to an emergency room because of the location of the pain/twitching. My heart checked out fine. I have an anxiety issue that may have started from inadvertent poisoning (pesticide) about 5 years ago while trying to save my fruit trees from beetles. At that time I developed a 2-month long condition where I felt a great deal of pressure on my chest as well as if I was wearing tight sleeves on both arms. My neck muscles were very tense. After a stress test and many blood tests nothing was found and the symptoms went away. Since then I have had anxiety when flying, riding subways and most tall buildings, towers, lighthouses. I would be interested in hearing any suggestions. I am seeing a doctor now but I just started with an new primary care doctor and of course he wants to go through the obvious. Today I saw a cardiologist and he said we will do a stress test but he was pretty sure it is not heart related since the symptoms improve with physical activity. Thanks for you help.