This is a site I have found most helpful to better understand numbers and levels http://www.drrind.com/thyroidscale.asp
Certainly you feel bad with A TSH 115. TSH can go dangerously higher but you and doc don't want that. I hope you are being treated by now.
Being hyper last year you might have been in the early stages of autoimmune Hashi. Which Hashi has a hyper phase first before going full blown Hypo/Hashi. Do you have last years levels of TSH, FT-4 and
FT-3 and this years levels. FTs on how they relate to each other tells the thyroid status like autoimmune thyroid (and more). In conjunction with thhroid levels, you can have specific antibodies done to confirm what levels already relate, however levels are the prevailing diagnose. And it seems doctors don't do the specific antibodies anyway. Although, it really doesn't make a difference as far as treatment, for Hashi is treated the same way as hypothyroidism, with thyroid hormone medication. However, having the specific antibodies done for both Hashi and Graves, might relate a possibiliy of a few other future and/or present issues.
Once you are treated, and find the correct levels or set point for you, it will take time to heal, for some a couple of years, after that, symptoms are probably not thyroid related.
Anyway, good luck and stay positive.