There is minor discomfort during the procedure but a local anesthetic will be applied to the area where you will be treated to minimize the amount of pain. Please contact a qualified provider or a board-certified physician with extensive experience in these procedures.
Im sorry to hear about your discomfort. They should have been removed 2 - 4 weeks after they were placed since they were still uncomfrtable. Few months later it will be very difficult to remove. I suggest RF treatment like Tempura over the area that hurts an dit will soften the thread. Can't...
Very likely that any foreign material like a tread should be removed once infection happened. This is the issue you should discuss with your surgeon. Good luck.