Sometimes these artificial medicines don't work accordingly that's how they do after sometime try some herbal medicines from TIENS or any herbal clinics because the more you go for those surgeries the more you weaken your self sometimes it goes with the age do a lot of walking and joggings believe me i know what am talking about,Artificial medicines do expire after sometime look you have already done 2 surgeries i think its time to try something new. Wishing you a quick recovery take care.