If they did not run an ANA and anti-dsDNA titer blood tests, they should. It is very common for those on anti-TNFs to develop anti-dsDNA antibodies. Most time they don't cause problems but when they do - it is DILE.
Have you been having low grade fevers or mouth sores? Sun sensitivity? [Off topic - is it really sunny in Iceland in the summer? I apologize for my lack of knowledge about your country.]
I do have a positive ANA but not sure if the anti-dsDNA has been tested. mouth sores is something I am familiar with.
The sun shines all summer long here in Iceland its sunrise at 3 am and it sets at midnight so only 3 hours off no sun :) But I have not noticed any sensitivity towards it because we had a super rainy summer the worst in over 50 years :S
I have to talk to my doctor about
all of this its getting a bit confusing telling everything apart. Maybe the symptoms are all related somehow