Abby, I do not want you to get discouraged. I did not put the info. out there about it taking 2 yrs. or more to be free of the rash in order to scare you. I put it out there to let you know that you can have flares even gluten-free. If I did not make you aware of that & you go along & then get a flare then you could think you don't have dh b/c you are gluten-free & here it is, the rash flaring. It's important to know that can & does happen.
Now, you were gluten-free & the rash resolved until you got into the seafood which = iodine overload. I take that as a very good sign in your case. So do not despair. You may not have a long haul with this stuff.
Looking back, in hindsight, now that I know what I have, I can clearly see that I was a celiac even as a kid. As a teen I could not tolerate beer. it gave me terrible gut issues & I refused to drink it b/c of that. So I have had this building in my system for 40+ years or more. I am 56 now. The rash began to present for me around 8 years ago. Mild, very mild at first. So I can see now that I was a celiac with GI issues & then it morphed into the rash.
Yours may be a totally different case.
I am getting better! Where the individual lesions or blisters used to last 4 to 6 weeks; they now are down to 1 - 4 days before they begin healing & the healing is much faster. I mainly only have it on my legs from the knees down & my ankles, feet these days. I get a few spots various places on my body but they are short lived & they don't itch as much. I AM healing. I WILL get there.