Colic baby?? Gripe water?? Help

Julii
My baby was born premature on October 30 ... He was 33 or 34 weeks (doctors not sure exactly) ... He was in the nicu two weeks.. He got released Friday the 13th.. N well since I've had him he has had about two or three episodes where he seeks very uncomfortable after eating and cries a lot and nothing I do helps .. I notice he tries to push probably to fart or poop.. Anyway everyone tells me it must be colic and well I do believe that is what it is... I'm taking him to doctor on Monday.. But for now everyone tells me to give him gripe water but since he was a premie and was in the nicu I would like to know if it's safe to give it to him without doctors orders?? I'm exhausted from feeding him every 3 hours and barely sleep (single mother) n now with this I really don't sleep !!! N plus I don't like seeing him in pain!!!! HELP!!