Hello Doctor My Name Is Vivek 7 Year Ago I

hello doctor My name is vivek 7 year ago i had pneumothorax then i recovered from it , then after one year it again happens to me this time the intensity was low and i recovered again by it , one year later i got it again but this time intensity was very much low when i compared it with first and second time.I never goes under the surgery as suggested by my doctor,but whenever i sits for long time then i feels some discomforts under my lower left rib also now cracking knuckles become a habit for me is it also have any connection with pneumothorax.