Feeling shitty

I honestly feel like such a horrible parent right now. I’m a FTM and I feel completely helpless to my baby who seems to fuss and spit up no matter what formula I’ve tried.

I’ve tried Similac advance (he began to get gassy, fussy, & crying uncontrollably.) pediatrician switched him Similac Sensitive (he did amazing, then began to get the same way again and was ALWAYS constipated.) so I decided to try total comfort (which was his next step according to pediatrician if Sensitive didn’t work) well two bottles into that, he spit up all 4oz, so I decided to try Enfamil Gentlease, well that worked wonders! But the spit up began to 2 oz every feeding and baby only drinks 4 oz, so the hunger and lack of sleep were reaaallll. I then bought Enfamil prosbee (soy milk), I feel like he’s doing decent, it’s only day 2, he’s getting fussy and fussy again, spit up is minimal, but chunky looking. His poop is green, kind of slimy but not that slimy. Looks like a yellow greenish. I’ll attach pictures. I just feel helpless. And like my baby isn’t eating properly.

I’m also aware I should consult my pediatrician before changing his formula, but I feel as if I’m not taken serious because I’m a young FTM. And the weekends just seem to roll around quickly that the office is closed. Even then, anytime I call to get an appointment day of or next day they’re ALWAYS booked solid and I’m waiting hours and hours before I get a phone call back.. sorry for the rant.