Baby cries at same time every night

hi

My sweet baby girl is 4 weeks old today ! She’s my first baby & I love her more than life. So our problem is that the past week now she cries a lot around 10pm. She wakes up from her sleep or if she’s awake she begins to cry hysterically . Gets red in the face and gasps for air at Times. Really makes me scared & feel helpless . She calms down if I offer her breast milk or just rock her around , but it does take 20’mins or so. I have to burp her & if I don’t after feeding then she gets gas build up ; I’m afraid it’s the gas that is causing her to be cranky . She still wakes up every 2 hours for feeding . She’s over her birth weight. I feed her both formula and breast milk . I’m exhausted & just don’t know what will help her . She doesn’t have colic I know that . I’m just extremely sleep deprived and exhausted. Anyone have any idea ? Can’t see my baby cry :(