Hi there - I too was incredibly surprised at how comfortable I was the first 24 to 48 hours post op (in my head, my tummy was a different story). I am 2 weeks post translate and have learned: drink way more clear fluids than you might think necessary as this will help flush out the toxic stuff and also helps the meds work better. Rest often - you will feel more pain if you overdo it. Take the meds as soon as its OK per x times per day schedule for a day or two, then interpret "as needed" as being when you first get symptoms vs when you can't hold out any longer (don't chase the pain it results in using more meds). I took the Oxywhatchamicallit at night only as soon as I got home, and haven't touched it for 3 days now - still taking Tylenol though.
For the constipation, lots lof liquids, lots of prunes, veggies, fruits, oatmeal, whatever floats your boat + get up frequently and wander around. I've been drinking a whole glass of hot water with a slice of lemon and find that helps with keeping things moving as well as being pleasant. Unfortunately. healing is not sensation free - but I'm pretty sure if you find you have too much pain after meds they let you go home with, you should check back in with your doc/surgeon (wouldn't want inflammation to get out of hand).
I have rough evenings, but it doesn't last more than an hour and I drift off to sleep - wishing you the best on this bumpy road to recovery!