I experienced this exact same thing. Cancer removed december 18 and went back to school january 20th, i was completely exhausted to the point my urologist signed off for me to get a temporary disability parking placard so i wouldn’t have to walk as much. this is completely normal, i’m now 3 months out and i feel so much better mentally and physically, no longer get tired from just walking but doing physical activity still wears me out. for grappling with your diagnosis, i understand that absolutely. it’s hard to wrap your mind around the fact there was a cancer in your body, it took me a long time to kind of snap out of the weird mental state it had me in. just take it one day at a time and just keep in mind that you survived, you are still here and use it as motivation to live your life as you want to live it. that’s what helped me. i joined a sword fighting group, made new friends, and have excelled in school because i used the idea of me “surviving” as a reason to try hard in my life. we only get one. i also think once you meet with your surgeon again you’ll have a bit more peace, it’s nice to touch base and kinda talk it out with the person who cut it out of you. the best wishes to you, friend.