Baby reflux vomiting since solids… please help !!

Since we introduced solids my baby vomits from reflux constantly. It’s awful. Every day with the exception of 1 maybe 2 days out of a 7 day period, he gets reflux projectile vomiting. Everything I read says 90% babies grow out of it by 1 year old. He is 9 1/2 months. It’s not even remotely improving. I have kept his weight up by giving only very calorie dense food and formula in little and often amounts., and only feeding solids once per day since more frequent solids is the obvious trigger that upsets his belly. I burp him all the time or at least try to. His diaper is loose. Thickening formula does NOT work, it’s the other main trigger fro vomiting. One bite of infant cereal and he pukes, it’s one good we can’t feed at all I am exhausted and constantly worried. Please tell me this will stop. Has anyone tried mylanta or maalox?? I’ve read they are safe in babies but any meds scare me.

Edit - so the doctor told me that the reflux vomiting is cause by an immature esophagus and up to 1 in 5 babies get this issue and grow out of it by the age of 1. Even with a total food washout of 3 days of just formula he can still get the issue. It’s not “acid reflux” like adults get, it’s just baby reflux vomiting caused by the esophagus still maturing in the first year of life. And as long as his weight stays in range then not interventions are done.

I’m just at my wits end with it. We were supposed to go on a small vacation(first in 8 years and the first time I would go anywhere at all since having the baby other than doctors appts). But we can’t go if he’s going to vomit in the car seat and we won’t have laundry easily available for his clothes, our clothes, bed sheets, stroller, high chair, etc. I’m so isolated. So many other baby issues wouldn’t have kept me Isolated… but it had to be this one 😢. I’m getting anxiety being stuck in the house and there’s nothing I can do but wait for him to grow out of it. Other moms go to mommy and me classes or the grocery store or to the park. I’m just here alone covered in vomit and praying it will end. No daycare will take him until it resolves so I can’t go back to work or even get a break. All day, all night, I stress and work hard to get calories in him and cry every time everything is covered in vomit again and we have to start all over. It consumes my entire life. I never have time to take care of myself. If it wasn’t for my constant efforts he would be underweight by now. But I’m near burnout 🥺

I am going to try again starting from scratch with feeding one food at a time. It doesn’t seem to make a difference even on just formula, but who knows I’ll try anything.