Aw mama, ang sakit naman sa puso yan, 2 months pa lang at gassy na agad, a few of us mums had the same struggle kaya alam ko how exhausting yung walang tulog nights. Since baby's purely breastfed and the constipation started at 2 months, I'd really suggest checking with her pedia asap kasi baka may underlying issue na kailangan i-address (like tongue tie or latch problems affecting digestion), hindi lang gas. In the meantime, try burping her longer after feeds, massage her belly in clockwise motions, and ang some mums sa circle ko swear by doing bicycle kicks with her legs, pero honestly mama, if she's only dumumi once since 2 months that's worth mentioning to the doctor right away kasi parang may something off there. Hang in there, you're doing great kahit sobrang bagal ng recovery