People are actually really bad at determining how they feel or how they are responding to treatment in the absence of detailed notes typically with some sort of relative quantitative metric. (RPE for example)
So no, you likely don't know the difference between feeling like crap and feeling "normal".
These sort of nefarious cognitive biases are what lead normal people like you into believing weird pseudo-scientific bull**** that is likely going to harm you. For example, you probably don't intentionally lie about positive behaviors, but you almost certainly do:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5639921/ In the same way you likely overstate your ability on certain things: <see any driving self assessment>. In reality you'll probably "cure" your entirely fake problem via cognitive action bias, so whatever. Hopefully the T3 doesn't kill you.