HELP...Cranky baby and stressed out mom

My 5 week old has been extremely cranky/ fussy lately. She wakes up suddenly screaming. She can't can't sleep or nap properly. The moment she wakes up she's grunting and pushing like she has to poop or pass gas. I have tried gripe water, baby massages, rocking, something called the Windi, feeding her and burping her. Sometimes I will get her to burp. Sometimes she will scream like she's in pain then pass gas. Her pediatrician said not to worry as long as she's pooping at least every day or every other day. We are currently 2days of no pooping. I dont know what to do at this point.