Acid reflux, gas, fussy

Help! My baby is fussy .. not sure if it’s gas or acid reflux or both. We do go back to dr on Friday- looking for other mamas who have had this problem...

she started sleeping better through the night for a good 2-3 days ... then over the long weekend I stayed at my parents house... she all of a sudden won’t lay flat in her pack and play bassinet - she seems very fussy (same amount of gas / tummy sounds as at home) not sure if it’s a mix of both - if it’s gas- if it’s acid reflux...

we are using similac pro total comfort .... should I try gentlease?

My mom said when I was a baby I needed the nutramigen formula...I’m just at a loss. Frustrated that I can’t help her.