Looking for some advice

I have been getting pain and burning in my left armpit and sore to touch for a wile now it comes and gone I get alot of discomfort in at my back at my lung also from when iv took covid everything seams to have escalated breathlessness and constant cough weak and tierd constantly I have had the fituge for a long time and doctors always put it down to fibromyalga but things have just got so bad over the last year or so iv also had a couple of funny turns were it has realy frightened me when I discussed it with my GP they just said if it happens again but with chest pain call a ambulance I just cannot seam to get well and feel well am 46 and look and feel like 76 ..a just can't get any answers to what is going on I have a appointment for a CT scan n a couple of wks time but am just at the point were a don't no what els to do I tried healthy eating taking my vitamins do all the right things but I never feel the benefit of it ..its concerning every test that's been done in the past when it's came bk with somthing they just say it nothing to worry about ..