Loose Sutures After Tummy Tuck

If the sutures broke shortly after surgery, this can result in a return of the bulge in the lower or upper abdomen. If the sutures break after about 2 months, the healing is probably sufficient that it won't matter.
If a bulge has returned after a tummy tuck, this can be due to weight gain or other factors.
In any event, it would be advisable to see a board certified plastic surgeon in this country for an opinion.

I don't quite understand why a loose suture would cause pain unless it is causing excessive stress on the remaining sutures. Perhaps, there is some way for you to contact your surgeon in the Dominican Republic and discuss a follow up appointment with options for treatment.

I am unclear as to why you feel you have a "loose suture." The muscle repair with a tummy tuck is meant to tighten the abdomen and decrease the bulges that can occur from stretching of the abdominal wall. After a few months, scarring will replace the strength of the sutures. Thus the importance of the sutures is really in the early healing period. I do not know why you would have constant pain.

There is a larger issue to discuss here and that is having surgery in another country, far from your home. For any surgery, it is important to have access to your surgeon for standard follow up care and to address any complications should they arise. This is especially true for cosmetic surgery. If it is possible, I would recommend that you obtain any operative reports from your surgery and see a board certified plastic surgeon in NY for a consultation.