Sorry to hear your poor little one might have reflux, my 8 week old was diagnosed just the other day. According to our GP, according to new NHS guidelines they're not allowed to treat reflux, as doctors have been accused of over-diagnosing it. Here are my suggestions:
Do get your baby a GP appointment so that they can confirm it is reflux and not a different problem with their lungs/stomach/bowels etc.
In the mean time: my health visitor suggested NOT changing formula (we started off bf and had to stop too) as baby is only just adjusting to it and changing between formulas could do more harm than good. Again, this was the advice I was given, do check with your own contacts first.
Burp baby a every ounce or so that they drink (although if baby cries for the bottle back then give it, as screaming means taking in more air) and make sure to burp afterwards. Keep baby's throat above their stomach for 20-30 minutes after every feed - this doesn't have to be upright, just at an angle. Put books under the head end of the moses basket/cot (we just put a sturdy pillow under the head-end of her mattress) so that baby does not sleep flat.
How old is your baby? Apparently they do grow out of it as their stomachs mature. My little one has been on Cow and Gate Newborn milk for just under a month now and the reflux has slowly gotten better. She still throws up a fair bit but it bothers her less. She wheezes during and after some feeds and has alot of trouble burping (note: farting DOES count as winding your baby, so if like mine she's gassy, at least it's coming out one end).
Apparently you may also find that your baby's bowel movements are infrequent, far apart and look more like a bf-baby's poops. This is normal when changing to formula and will take a while to calm down. If you think baby has diarrhea however, call the doctor.
Again, I must stress that every baby is different and this is just the advice we have been given that HAS had a positive impact. Make an appointment with your GP immediately (make sure to tell them baby's age as they should be seen as soon as possible) and call your health visitor in the mean time/take baby to baby clinic.
Best of luck and I hope it gets better soon x