Kelly, please get along to that IRL support group. With the reflux and the pain, I'd be beginning to wonder about something like a posterior tongue tie that won't necessarily be obvious to spot, but would be causing a number of the issues you're describing. If not that, then they will be able to see and assess what's going on by seeing you do a feed than we can through the medium of text.
Big hugs, sweetie, you're doing great, but sometimes we just need that extra pair of eyes which, in generations past, would've come from family