Need help!

Courtney • I have the most beautiful daughter in the world, Paisley Anabelle 12/8/16 @ 28weeks, 2lbs 5oz! In the NICU going strong!
My baby girl was 28 weeks, she's almost 5 months old but suppose to be 2 month if she wasn't early.
Anyways, she has been so fussy and not eating right and keeps on and off farting??
Anyone know what I should do?
The doctor already has me giving her miralax in her formula every other day.
Should I try gas drops ?