My antibodies halved when l quit gluten but it took some time before l felt better, six months l think but consider whether you are still ingesting gluten. Some are sensitive to shampoos that contain it and licking the back of stamps etc. I was eating supermarket cooked chicken portions till l found out they had gluten on them.
"Why do l still have thyroid symptoms" by Datis Kharrazian DHSc, DC, MS, MNeuroSci, FAACP, DACBN, DABCN, DIBAK, CNS is an excellent book l think for help in understanding autoimmune thyroid disease. No doctor in the UK has a reputation for that and understands the importance of diet. Numerous studies from various countries show the connection between gluten intolerance and Hashimotos. Details in the book.
You may need to also quit dairy after doing your own research on it or go the whole hog like me and go on a paleo autoimmune diet like the one Dr Terry Wahl's MD recommends and l can report improvements all of the time after three weeks of this, and that is just the start whereby l am still not getting it 100% correct.
I am seeing improvements especially regarding my pre diabetic symptoms and losing weight without trying. The big issue is intestinal permeability and quitting all grains is where most research is headed. Dr Wahl's is conducting her own trials at the moment.