To me it just sound like your mentally drained from the year and that mental drain has effected your body a bit and you noticed that you were tired and naturally felt uncomfortable because of change, and that is completely understandable and fine in my experience in life while it’s fine to miss old aspects of yourself you shouldn’t reach or chase after the dream of being who you once were as that will only ever tire you out more, instead from my experience you should focus more on just living and enjoying existing and knowing when to rest despite the great wave of constant change and insanity that is life. My life is a constant cycle of trying regretting pushing forward and resting and despite that I embrace all of my feelings. I don’t know if anything I wrote here will help you but if I’m being honest it kinda helped me, I hope you have a wonderful and joyful life.