Gaining weight even with good levels

Hello!

Based on my levels, can anyone tell me how can I still gain weight?

I do intermittent fasting Monday to Friday.

I'm in calorie deficit and I also started to use treadmill and I walk every day. I feel like my body is not working and not reacting to anything I do. I feel awful and I hate to look in the mirror. 😭

I started with 50 mcg, and I take 75 mcg Synthroid since November.

My recent levels are:

TSH: 0.41 (ref.: 0.35-4.94) T3: 5.5 (ref.: 2.8-6.5) T4: 14.1 (9.0-19.0) Blood sugar (empty stomach): 4.7 (ref.: 4.1-5.6)

Maybe I'm diabetic and I need further examination? 🥺