It's the weight gains and the nappies that are the real indicator as to whether he is a 'high maintenance' bub or whether he actually is hungry. Given his weight gains and napppies are consistent with his size, then I'm thinking he's just a normal baby with reflux.

If I were in your shoes, I'd give the reflux meds at least a week to kick in and check that the dosage is correct. Introducing formula when reflux is in play can make things worse and you might be creating yourself another set of issues.

Is this your first baby? My first was a very unsettled baby. He would cry and cry and cry. Like you I searched for everything that could be wrong and only time made me realise that nothing was wrong, but being a baby was pretty overwhelming for him. I've just had my second and he is a completely different kettle of fish. He doesn't cry much at all - after my first experience I'm finding this very unnerving!

Hang in there - it gets easier and you get better at being a mummy.