Unfortunately, for a GF diet to be of benefit it has to be totally GF (unlike those avoiding dairy who can benefit from various levels of reduction, as well as exclusion).
I'm afraid introducing gluten into your life for a few days isn't likely to make a significant shift in your antibody levels. For strict coeliac testing the requirement is for a number of weeks, if not a couple of months.
When discussing my own challenges with the Endo who told me to go GF, his view was there was no benefit to me by deliberately stimulating inflammation when it was perfectly evident I was gluten sensitive. He likened it to hitting one's thumb with a hammer to see if it hurt. We talked briefly about biopsy, which I elected not to pursue, bearing in mind any diagnosis would lead to the same outcome - a strictly GF lifestyle.
The benefits of a definitive diagnosis are of course that certain foods may be available on prescription, and that condition would be in your medical records, should you ever require hospital treatment long enough to need to be fed.
