I think I would first suggest seeing a different doctor although many do this adjustment up/down according to your TSH only, whilst ignoring any symptoms you may have.
Email firstname.lastname@example.org and ask for a copy of Dr Toft's article in Pulse Online. Read question 6 and discuss with your GP that you need more instead of less to relieve you of your symptoms. Dr Toft says some of us do need a suppressed TSH. Ignore his last sentence of course as it makes no sense putting the oness onto the patient rather than the doctor.
Oh, for doctors to be sensible like this one.
Our doctors have no idea what it does to our metabolism if we have hormones (100 is quite a small dose anyway) adjusted to the TSH which varies throughout the 24 hours. Neither do they realise the damage that the patient can occur if underdosed. If we are overdosed we would reduce meds ourself due to the hyper symptoms. We can get other diseases due to too little thyroid hormones. T4 may not convert sufficiently to T3 which is what drives our whole body, from brain, heart and every single thing.
We have to read and learn in order to get well, despite the guidelines laid down by the BTA et al.
When you have your next blood test, fast and have it as early as possible (TSH is highest then). Leave around 24hours after taking levo to have your blood test as it may skew results.
Ask also for Vitamin B12, Vit D, iron, ferritin and folate. Also ask for the addition of T3 as Dr Lowe advises (although the amount he suggests is now out of date but a little is better than none).
Always get a print-out of your blood tests with the ranges for your own records and so that you can post if you have a query.