Is anyone else taking Synthroid for a Thyroid condition?

How long did it take to start working? Did your energy ever come back to normal?
I’ve been taking this medicine for nearly 3 years now. They’ve really played with my dosage (especially during my pregnancy last year). However, just when I was feeling better they did a test and my TSH level was 0 so they dropped my dosage, now I feel like crap again. Is anyone using natural supplements in addition to Synthroi.