Worried about lung cancer

Evening all,  

I previously suffered from severe health anxiety. I had CBT and was making really good progress. However I've had a slight cough throughout December (I put it down to me smoking too much - 10 a day which is a lot for me and I have smoked since throughout lockdown). That seemed to go, then three weeks ago, I started to get shooting pains around my right breast, along with a stiff back and shoulder. This then spread to the other side. It comes and goes every day, from one side to the other. I don't have it at night. No trouble breathing, no pain on deep breaths etc. 

however I'm now terrified I've got cancer. I was rushed into A and E last night as the shooting pains intensified, but ECG and bloods were fine. I got told it was physiological and there was nothing wrong with me. 
 

kind of convinced I'm being palmed off?