What is with this piercing!! Advice please

I got it pierced over 6 weeks ago and it fell out last night. It had this for a week, 3 weeks ago then healed and now its back whatever it is! If i go to the place that pierced it with a diamond stud from the jewellers, will they insert it in or will they simply tell me to leave it because of suspected infection. I think its a reaction to the shitty stud they used because i have been keeping it very clean! I really couldnt wait for the 6 weeks to be up so i could put my own real stud in and now this. I really dont want it to close over or pay to get it pierced again like that 6 weeks wait looking cheap was for nothin!