I Have Been To Many Doctors That Are Not Finding

I have been to many doctors that are not finding anything! have dizziness get light headed shaky head out of focus! Deep down in my lung on the left side it hurts and I get short of breath I have had x-rays and they have diagnosed me with very minor copd I haven't smoked in 22 yrs. I recently started taking symbacort, on my second time of prednisone in the last month I am on my second antibiotic also for ear infection and what they r calling bronchitis! Feel very frustrated thinking there is something in the lungs that the docs are not finding lung cancer is in my family and I need to figure this out