Help! Constipation! Came back again?

So in feb i was treated with sultamicillin and doxycycline for h pylori(2nd treatment in 2 months), before that i was treated with amoxicillin and clarithomycin which didn't work. 2'd treatment had worked wonders but after 2nd treatment, i started having bowel movements 3 times a day, which was okay, but since lst 2-3 days, i started having constipation. If i miss an urge to poop at morning, then i have to wait for another urge. And my farts have increased. Apart from that, I don't think straining is a good idea as i read that it does more bad than any good. So i am avoiding it. Once or twice i had to put my fingers and get it out, tiny pieces are there at the end of anus. Why all of a sudden this constipation came up! This constipation and severe farting was the symptom after my first treatment which indicated that h pylori was not gone, but it was relieved after 2nd treatment. Has the infection came back again? M afraid! Please help me.