I was originally on T4 for 18 years, and in the meantime got diagnosed with ME/CFS on top. I had a lot of stomach issues both before and after getting hypothyroid and got much worse after ME relapse 4 years ago, and have had to cut my foods drastically due to food intolerance.
I went T3 only for a year last year, and though it got much better, I do have misgivings re T3 only, and would prefer more of a balance with T4 if possible, and I find T3 is difficult due to the short acting aspect. I have restarted T4 at 50mcg over a month (did try 100mcg but felt awful on that), and am not too bad, but I think the fillers are causing me issues. I think the fillers in T3 do too, but not so badly.
I am hoping that my GP will prescribe the liquid kind as though expensive, it's no dearer than the T3 which she is already prescribing at great cost. I am not entirely sure what the liquid T4 has in it, but it must be better than the tabs presumably?