I know this sounds mad but here goes. I have a constant feeling of shaking, heart racing very short of breath. Have pain down left arm and neck. Went to hospital ecg, many bloods all fine was relieved but still getting this. now I do have a neck problem which could cause the arm pain also hiatal hernia and reflux. The thing is it feels like my breast sticks in my solar plexus region, where ribs end in front. Feels sore Had abdominal scans etc nothing. So can anxiety cause all this. I have got worse in last two weeks since I had my vaccination but had had spells of this before but not 24/7. Was not anxious before but am now. Feel jittery too even in sleep. Any advice