Colic baby and what to do?!🥺

I have my two week old baby yesterday I noticed around 4am that she stiffen up when I would feed her she has two poops yesterday one at 5am and one around 12pm. I was so worried because throughout the day she was getting worse crying while feeding stiffening even more. It got to the point at night where she didn’t want to eat and 12hrs passed and she hadn’t gone to the bathroom! I’m a first time mommy I ended up taking her to the ER I was really concerned of why she hasn’t pooped and I can tell she tried several times and she’d scream and cry like she was in pain. Once I got to the er she finally poop after she got her temperature taken. Today I still feel like she’s still not ok. She’s not as fussy and crying as much as yesterday but for two hours she didn’t burp or pass gas and I saw she started to stiffen her body again. Is this colic ? If so what can I do.