Reflux, Colic, & Jealousy

My son was born 5 weeks early he is currently 3 months actual. He has reflux and is on medication for it and is also colicky.. He is very clingy to me and I do love it, but also I'm exhausted.. Dad helps out as well, but I'm on night duty daily as I'm not working still. Unfortunately even with medication his reflux is still bothering him a lot causing him to not want to eat much, but instead eat often. Which means I'm getting up at least every 2 hours with him at night then getting up and getting our older daughter ready for school and then trying to accomplish other daily tasks with a screaming baby who I cant leave his sight at certain times when it's bad. We just moved a month ago and I still have so much to do because of this and because I'm exhausted! I really just need some words of encouragement from other moms.. My older daughter (almost 8) is also extremely jealous lately of her brother. I'm having a hard time juggling it all and still feeling like a good mom at the end of each day..