I am So sorry you are having these difficulties @CurlyCurly and it definitely doesn't sound 'right' to me! Has your GP or medical team suggested an xray or scan of your lungs? Sometimes a specialist diagnostician is needed to 'think outside the square' .... you definitely need a diagnosis & hopefully a solution, so you can get on with life!
I also have 'chronic inflammation' & have had for 10 years or so (well before I was diagnosed with BC) and I put it down to my ongoing arthritis.
Take care & all the best xx