If it's something like a hot flash then it could be the side-effect from the Levo as it can take a few weeks to develop side-effects. Especially since your doses have been so up and down.
I don't think the changes in your dose has helped. Did your GP change your dose in this way? Not everyone reacts the same way to the Levo, regardless of how much their dose has been decreased or increased. Same if anyone takes T3 medication or NDT - in fact any medication for that matter!
Sorry, I meant to explain that even if you do have hypo symptoms it is quite common to get some hyper ones at the same time. Hyper ones can include sweating/feeling hot but that doesn't mean to say you need to have every single hyper symptom to be in a hyper phase if that makes sense. Just that they seem to be more prominent.
With me, I get hot very easily, constipated, tired and start losing weight. So I get hypo and hyper ones at the same time.
By the same token I can get cold very easily, gain a little bit of weight and very hyperactive. Again, a mixture of both hyper and hypo too.
I meant to explain (although not very well!) that although your TSH is 1.99, according to the medical community in the States, a patient's TSH should ideally be 1 or under. We are not in the states I know, but most people feel better with a TSH of 1 or under and their FT4 levels to be at the higher end of the range:
"In their guidelines, the National Academy of Clinical Biochemistry reported that: "In the future, it is likely that the upper limit of the serum TSH euthyroid reference range will be reduced to 2.5 mIU/L because 95% of rigorously screened normal euthyroid volunteers have serum TSH values between 0.4 and 2.5 mIU/L." They also stated that "a serum TSH result between 0.5 and 2.0 mIU/L is generally considered the therapeutic target for a standard L-T4 replacement dose for primary hypothyroidism."
So your TSH is 0.99 points under range. This is not taking NHS guidelines into account as so many people including me feel absolutely terrible with a TSH of even 2.7! I'm not saying ignore what your GP is telling you what the ideal TSH should be as they are only going on what they have been taught and trained to know, but more the case that having a TSH straight down the middle is not exactly a "one size fits all".