I am not a man so feel free to dismiss my input… but I relate to the desire to live life to the fullest after somewhat reclaiming my health after colectomy surgery. I was so happy and relieved to not be controlled by my symptoms, but also experienced simultaneously some new versions of depression and anxiety. Honestly I think years of dealing with chronic illness takes a collective toll on our mental and physical health, and it takes time to fully “recover” and recalibrate. And even feeling much better after surgery we still can’t expect our bodies to be “normal” - we’re missing an organ after all!
I had to do some internal work finding peace and rest within my limitations… not pushing myself too hard and enjoying the gifts I have been given. And really I can do a whole lot more than I used to, but I still feel a little bit more fragile than the general population. As I tell my husband, I’m like a super car… I require fine tuning or I don’t operate well 
I still enjoy doing things that were previously very difficult for me - travel, sports, working out, social events… but also try to be mindful of when my internal drive switches from fun to pushing too hard.
Unrelated and maybe obvious, but might be worth looking into nutrition/supplementation for the low energy. Maybe not focusing as much on weight loss but feeling energized and well. Even though my blood work usually looks good I try to keep up with a good multi-vitamin, magnesium, etc. because I feel like without a colon I’m at a disadvantage. The book “What To Eat With IBD” is a resource worth checking out.