I am 51 years old, and was very active and healthy proior to my rupture. I too just have had reversal due to perforated diverticulitis, with perotinitis. My rupture was in March of 2016 and the reversal was Nov 2016. I came through the resection surgery and felt fantastic ! Way beter than the first time. A couple of days in my body decedided it was not having anything to do with this and I got a ileus for the next 12 days. That was not fun. I was determined that I was not getting that bag back and started doing some yoga moves while laying in the bed. (knees up towards the side of your chest, called the wind removing pose) I needed help by my family to get my knees up there, LOL, but by the end of the day, things started moving. Ya Hoo! All went well after that and I was out of the hospital 3 days after the first movement. If it wasn't for the Ileus all would of been great. One thing you should do is make sure you walk afterwards, I did a walk around the hospital halls every hour. Even with the Ileus I still tried to walk once an hour. Some walks were longer than others, but as long as you walk a bit, things with heal quicker. I am now 3 months past surgery and I have a partial blockage at the reconection site. Will be going in on Monday to get it stretched out. It is rare, and is done through a colonoscopy, so no big deal. It has been a rough go, but in the end it is worth it all. You are young, you will bounce back quickly.
I too read all the stories posted here and was quite horrified to go through with the surgery, but then I kept thinking people dont post the good stuff, just the bad stuff. Take all the bad stories with a grain of salt, and keep thinking positive ! Dont worry it is a very routine proceedure now a days. You have already gone through the rough stuff. You got this !