Is this reflux?

Now Sisi will nurse and then after she’s done within 10 minutes she’ll start to squirm and fuss, then she’ll spit up and burp, then she’ll calm down and goes to sleep. She’s easy.

Greenbean, my boy, will nurse and occasionally start crying in the middle of nursing. He starts squirming and crying and will try to latch on but then squirm and fuss again. Sometimes he’ll nurse then fall asleep and wake up in 10 minutes and fuss until he’s held. And he doesn’t want to be held cradle-style. He wants to be held upright. Sometimes he’ll calm down after he burps but usually will not relax when he’s lying flat on his back. From about 6pm at night til 11pm he’ll cry unless he’s walked around in a Baby Bjorn or Moby wrap. Every night it’s the same story. And sometimes Sisi will do the same at night. But Greenbean is the tough one.

Greenbean is on Zantac but I’m not sure it’s working and he’s been on it for 2 weeks. I eliminated coffee and most dairy and soy (at least the main things- milk, yogurt, ice cream, etc.) and that seems to have helped but I really think that Greenbean is in pain when he’s laying on his back. I can’t even let him lay on a Gymini for long before he starts to cry. My first 2 kids LOVED that thing and sometimes would fall asleep on it.

So, that’s the story. Can anyone tell if this IS reflux I”m dealing with? Or is it just bad gas (because the twins are constantly passing gas and have bubbling bellies). I’m pretty much on my own with the twins after 10pm. So this is challenging.

I appreciate any help you can offer.