Hi all, how did your nights go? Did the bottle of formula help keep, and how did the naps impact cute? Sounds like you had a really rough night regression!
Well the HV was actually quite helpful! She came up with lots of suggestions which we're going to work through, including changing his position slightly when feeding so that he's comfier and will hopefully feed for longer, putting him on infacol to try to help relieve his wind, trying to do a dreamfeed from a bottle to help him get used to it, feeding him in a lying back/down position as I have a fast letdown so he ends up gulping, winding him by lying him over my knee to get more wind up. We're hoping if he's in less discomfort he'll sleep longer as half the time I think it's the wind waking him, not hunger but then he wants to nurse for comfort.
If we can get him to accept the bottle then we'll try a formula feed at night to see if he'll go a bit longer before waking, just so I can get a bit more sleep. I feel somewhat guilty for doing that, but I'm getting so tired I'm grumpy and snappy and the 2 DSSs are getting the brunt of it which is unfair to them.
Last night was an improvement though, I'm hoping because I'd started the infacol in the afternoon. He woke an hour after going to bed (which was frustrating because he normally goes 2 hours then so I'd not got the bottle ready and didnt get the dreamfeed opportunity - and wasn't staying up another 2 hours in order to try it!), but he then slept 3 hours, then 2 hourly chunks, and when he woke to feed he let out some of the most amazing trumps which stunk to high heaven! But he didn't seem to strain to pass those, whereas previously he'd stop feeding, cry out, arch his back, tense his legs etc to get them out. This time he just carried on peacefully nursing whilst creating his own potent smog around us 
Plus this morning he slept for 50 mins instead of me hoping for 20 and is now down for his lunchtime nap so we'll see how long this one lasts!
She also recommended we try a Doidy Cup if he wont accept the bottle -apparently they're suitable from 3 months, so that could be further option. Oh, and she's said to try him with a teaspoon of orange or prune juice to help get things moving a bit better too - he's not all that impressed with orange juice though so far!
Anyway, I feel a bit better with some options to try, and she's going to pop by in a fortnight to see how we're getting on. Fingers crossed!