I was first diognosed with Hyperthyroidism when I was 16 (after 5 years or so hard years of investigation) and then recived treatment with medicine (carbimazole) for almost two years. I was healthy for about a year but then relapsed again and now I have to choose between RAI and surgery and I dont know which to do, they both result in hypothyroidism

Not only can I not handle these sickeningly familiar symptoms coming back but I don't know how to explain it to people. My memory and concentration are awful, my mind is foggy and grey, I'm depressed and tired all of the time and noone understands because I look healthy and have no visible symptoms. I've been on 5mg of carbimazole for around 2 months and a half and I initially felt a tiny bit better, but now I feel worse than I did before the medicine. I recently found out that my thyroid level was 12 (went down from 25.6 two months ago) I was told that it was fine but that seems quite low to me? Can anyone relate? I feel like giving up.