u/Deep_Method_820

I’ve been riding consistently for about a year and a half. Average 75-100 miles a week between gravel and road. I had a professional bike fit about 6 months ago, and everything seemed fine. Since upping my mileage, I’m having sciatic pain almost every ride. It kicks in around 18-20 miles. Has anyone dealt with a similar issue and any suggestions? I’ve been doing lower back stretches/ strengthening exercises the past few weeks but nothing seems to help.

I have been in levothyroxin 150 mcg since 2019. I intentionally lost about 35 lbs from May-November through diet/exercise (172 to 135) of 2025 and emailed my doctor about symptoms of over medication (increased HR, jitters, feeling restless). She lowered my dose to 112mcg after my ths came back at .87.
Fast forward to my annual physical this week, I’m feeling relatively good- weight loss maintained, exercising regularly and even saw some of my labs come back vastly improved (lipid panel in particular). To my complete and utter shock, my THS came back At 44!!!! Not 4.4, 44! My jaw dropped. My doctor immediately called me asking if I felt ok and that we needed to get my dose back up.
Has anyone had a similar experience to this? The 44 alone is shocking, but the fact that I feel relatively fine is even more shocking. My t4 came in at .82.

Any tips or advice for my first time trial race? I’m definitely what you’d consider a beginner/novice and I’m doing this to push myself outside my comfort zone. What should I expect? Pretty confident I’m going to get smoked but any words of wisdom are appreciated.
For context I’m 40/f and have been cycling just under a year. Average 40-60 miles per week primarily road and gravel. I’ve done 2 cycle cross races and otherwise am completely new to the racing world!