I'd just logged on to find the reflux thread to ask a question regarding reflux/gaviscon/comfort milk/constipation. I'll try not to hijack your thread but will give my experience, not sure if it will be of any help to you, but I hope so!
My dd is 13 weeks, she's been on C&G Comfort since I stopped expressing and bottle feeding (she never latched on and just didn't "get" BF, whole other story...) at 4 weeks as seemed very colicy.
Initially it helped but she became more and more refluxy. She's been on Gaviscon for around 2 weeks now which has helped with the reflux generally, we still have bad days but she is feeding and sleeping again and no longer screaming in pain constantly.
She only takes 6oz per feed but the doctor advised us to still use 2 sachets in each feed as she's over 10lb (she feeds 5-6 times per 34 hours) and we carried on using Comfort Milk. It makes it VERY thick and we have to use vari-flow teats (we use Avent bottles) but she keeps it down pretty well and after a quick burp can go straight back down at night which is bliss after having to keep her upright for half an hour after each feed!
The only problem I've found is she seems very bunged up and we're getting almost solid poo's most days. Today's she's been quite grizzly and generally seems uncomfortable and straining. I tried the C&G careline earlier having heard good things, to ask if this was because the mixture was too thick and if I would be better off going back onto C&G number 1 as if she was colicy, fingers crossed she might have grown out of it by 13 weeks (perhaps?) but didn't really get anywhere with the woman I spoke to.
As it it I've just given her a bottle of number 1 and will keep the rest of her feeds on Comfort for today, then up it to two bottles of number 1 tomorrow and keep going like that and see how we get on.
Sorry for the long post and I hope you find what works for you as trying to find anyone who can you give any helpful advice on reflux, other than the ladies on here seems bloody difficult!