Infant, male, 8 weeks, is it colic or something else?

I am at a complete and utter loss with LO(little one) 2. He is 8 weeks and colicky (?) AF. Husband says I'm being extra but I just want to make sure there is no medical reason he is like this.

I'll explain: LO 1 had acid reflux he was prescribed zantac and when that was pulled they gave him pepcid which didn't work for him so they gave him nizaditine which was fine. LO 2 also had reflux symptoms(silent reflux they called it. He would be super gassy, silently vomit out of nowhere, arch his back and scream after eating but still gaining weight). They put him on pepcid, it works for about 3 or 4 hours then stops (the arching his back and screaming is back) it is a once a day medicine. They prescribed nexium which doesn't have a generic in powder to liquids form for babies and it's $50 a month with our insurance which we can't afford while I'm not working. I called the pediatrician and explained this. They contacted the insurance and supposedly got it covered, awesome except it's not covered they just allowed it as a medication under our insurance we still have 50 copay. 🙄 So I asked if they could give him nizaditine she said no because it's in the same family of medicines as pepcid.... Okay well pepcid didn't work for LO 1 but nizaditine did... Some people can be allergic to one thing and not the other in the same family of medications so...

He has an apt Monday and I'm going to demand an allergy test for LO 2 because all while this is going on they're also trying different formulas, (he was breastfed for 4 weeks and supplementing with formula) nutramigen first which didn't show a major improvement to justify the price of it, then gentlease which makes his poop smell like a fresh killed oppossum in the florida sun, then reguline because when he has gas or needs to poop he grunts and strains and now A2 which I can't tell if it's working. He has been up since 7 and hasn't slept more than 3 hours today, it's now 7pm.

What is the likelihood that he has an allergy versus reflux? Why is the doctor not willing to try another medicine in the same family? Should we see a GI specialist? I was looking into either goat milk formula or HIPP formula but I hate keep switching him and his poor stomach is constantly gurgling and he acts like he's in pain.

😳