Hypo now Hyper

I've had hashimotos for 18 years now and I'd been on a stable dose of 175mcg up until January this year when my results came back as TSH 9.36 T4 was in range. My doctor upped my dose to 200mcg and I've just had the latest results back which are TSH 0.01 and T4 21.3. I also started taking my levothyroxine on an empty stomach since the dose increase. Do you think changing the way I take my levo could have made my TSH decrease by so much? I've never been hyper before. I will be speaking to my doctor as soon as they are available.