Feel like I can't help my baby😩

My little boy is much more aware now, he's so happy and active when he's not so unsettled.

Since birth he's always had trouble eating. Weights been up and down, not gaining enough, we've been told he has reflux then protien allergy and the cows milk allergy. Went from exclusively breastfeeding to having to have prescribed formula because of his problems.

No milk has help him, he's constantly throwing up every 5 minuets and it's from projectile to just constant streaming of vomit. He's been pooping a lot more lately and is only happy for roughly half hour after pooping. Everytime we put him down for a nap he vomits and then gets so unsettled he doesn't want to sleep. All day he's in our arms being propped up, so he can bring up his vomit as we have had a few scares when he almost choked.

We try and do tummy time as he's supposed to have that multiple times a day bit he hasn't been able to have tummy time because everytime he's on his stomach also vomits and cries.

We have been to see the pediatrician, doctors, Healthcare visitor and dietician to help but all we get is "wait and see". My baby barely can have playtime, doesn't have timmytime and all he has is cuddles from us as thats all we can do with a little bit of playing with his toys😭

My boy needs his stimulation but it's so hard because of his problems. We don't know what to do and I feel like such a shit mum as I feel like I can't bond with him much, neither can my partner.