Millsy, you've had the worst possible luck with your HV - she should never have put you under such ridiculous pressure. With my ds, at 2 weeks I was pressurised by the midwife to supplement him with formula. With my dd, however, I had (still have) the HV from heaven, who supported me fully in my desire to breastfeed. At 4 weeks, dd had only just regained her birthweight + 2 1/2oz and fed approx 3-hourly. And yet, when I compare their charts, overall they gained at almost exactly the same rate once they had passed their birthweights.
These charts are diabolical! Babies gain, grow, and develop at their own rates. Far more important than the centiles is the baby's behaviour, particularly, at this age, the nappies: are there plenty of wet nappies and pooey nappies (a fully breastfed baby may only poo every few days, but does plenty and it's always very liquid)?
It should still be possible for you to reinstate breastfeeding - if you want to. Get in touch with the NCT, they have excellent breastfeeding counsellors who will talk to you as often and for as long as you want, to help you find a way of feeding that works for you and your ds. At this time your boobs would still need stimulation at night, so you'ld have to wake Jake, but he'd probably be hungrier at first and more willing to feed at night (mind you, a sleeping baby at night is lovely!) Basically reinstating breastfeeding would mean giving up most if not all of the bottles, and stimulation, stimulation, stimulation! Also you would have to rest and drink plenty. You can give your milk production a little help by taking fenugreek capsules. You can get them at good health food shops, they're just ground up fenugreek seeds, and you take a lot, much more than the recommended dose (there have been several threads on this, so search under fenugreek and also under domperidone). I used fenugreek very successfully.
On the other hand, he sounds like he's taking all he needs from the bottle at the moment. Trying different bottles/teats/formulas can help to make feeding more pleasant. If he's a windy boy make sure you feed him in a fairly upright position, and give him opportunities to burp during the feed as well as afterwards. A good way to shift a stubborn bubble is to lay the baby down for a couple of seconds and then raising them up to burp. Ds always burped after being layed down or tilted on to his side, whereas dd would burp after being layed on her back.
A long blather - I apologise - but I've been in a similar situation and I recognise your distress. I'm no expert, so before you do anything, please talk to the experts (the NCT for starters).
And do let us know how you get on, whatever you choose to do.