Just saw your post and had to come and say that you're doing everything right, babies are awkward little buggers, and sometimes your days just seem to be one long, never-ending struggle. This is absolutely normal, I can promise you. I've seen 3 babies in our clinic today, all of whom are doing exactly the same things during their night feeds. It's probably a combination of wind/colic, a little bit of over-feeding (boys are notorious for this, it's just to get your supply up to the next level as they grow so quickly at this age), and general discomfort in the heat. Please don't think that this is the end of your journey, like all of the best journeys, you will occasionally hit a bump in the road!
These days honestly don't last forever, although I know that it can often feel like you take one step forward, then three steps back!
True reflux isn't that common, and symptoms of over-feeding and trapped wind can be similar. If your baby is vomiting after most feeds, and is bringing up more than a teaspoon or so of milk, if the vomit is "frothy" and if it also comes out of their nose, and if they're obviously uncomfortable at most feeds, then it's definitely worth getting checked out by your GP. Babies with reflux also tend to have slow weight gain, so if yours is up to and above BW by day 10-14, it's possibly not reflux. Having said that, no-one knows your baby better than you do, so if in doubt, ask a doctor. We would rather you waste everyone's time, than something serious be missed, so don't rely on Google, but do trust your instincts.
I'd also like to tell you all, that you are amazing! No matter how you feed your baby, no matter how you gave birth, and no matter what you think that you're doing "wrong", you inspire me every day. Women are amazing creatures, and caring for a young baby is the hardest job in the world, don't let anyone tell you otherwise. It's lovely that you're all so supportive of each other in here, and that you all recognise that this isn't a competition. Long may you flourish ladies, you're all doing a wonderful job!