Hi @Zizzy1591 I can totally empathise with your situation. I was diagnosed 9 weeks ago with underactive thyroid and put on 50 mcg of Levothyroxine. Almost immediately I felt great but this soon began to wear off and I became so exhausted that I had to take the odd day of work sick. 6 weeks after starting on Levo I was not functioning, in that I was so exhausted I could not get dressed, could not find my words to speak due to horrendous brain fog and I was an emotional wreck, lying on my sofa crying most of the time but over what, I did not know - needless to say I could not work.
I saw my GP who increased my meds to 75 mcg of Levo and I started to function again and managed to get back to work. 2 weeks after that I was off sick again and back at the doctors with my 3 main nemeses; exhaustion, brain fog and anxiety. GP said he couldn't increase my meds because it had only been 2 weeks since they had been increased and may still need time to properly kick in but he did sign me off sick for 2 weeks which was a relief - I am currently in the second week of this. I am having days without brain fog and anxiety but I still feel tired even though I am not doing much physically. I have gained weight steadily for the last 3 years. I thought that once I was on Levo I would start to lose weight but this has not been the case.
I too have felt powerless with this illness and so in the meantime I am following advice that I have found on this forum and have ordered a Vitamin D home testing kit (the GP wouldn't test for this) and a food sensitivity test to see if going gluten and/or dairy free will help me. At least I can then either rule these things in or out and will hopefully put to bed some of the questions I have whirling around in my head.
I am booked in for a blood test at the beginning of Sept but if I do not feel well enough to return to work before then I will go back to the doctors for an extension to my sick note. I have finally accepted that I have a long term condition (to be honest this has been hard to accept) and as such I need to manage it accordingly. If this means being a regular at the GP surgery and taking time off work then so be it.
Sorry for long post but as you will see from this forum, you are not alone. I hope you start to feel better soon.