You're doing brilliantly, and it's great that the feeding is going so well.
My story is a bit different but it has a happy ending 
My twins were born at 38 weeks, which is pretty good for twins and not considered prem. Ds was 7lb3oz so pretty huge for a twin and looked a bit of a fraud in scbu, borusting out of the teeny babygro they'd put him in! They were born after a pretty traumatic emcs with me under ga. Ds was well enough to visit me on the ward that night but dd wasn't, so i didn't meet her until the next day.
i remember sobbing in bed at about 5am the next morning as everyone else had their babies with them except me
, so they put me in a private room after that. I also remember still having their brand new sleepsuits with me as they were whisked away and then dressed into the hospital's baby clothes while i was still under the ga. It seems silly to get upset over that but at the time I was an emotional wreck and meeting my baby for the first time in someone else's clothes was horrid.
Anyway, then happy ending is that despite being tube fed, having bottles and a bit of formula in the early days (there was no way I could pump enough for two), me having a section and DD was pretty tiny, they latched on like pro's from day 4 ish and I fed them both until they were two. My supply kept up, just about, and they're bouncing 3 yo's now.
Those early days are such a rollercoaster but in time those memories will fade, to be replaced by many more lovely ones.