Hi OP, I am sorry it's so hard for you at the moment. It sounds like my DD when she was a baby-it turned out she had silent reflux and the right medications helped somewhat, but it took us ages to get her diagnosed, then to get her the right dose etc. Gaviscon didn't do anything and was impossible to administer-I gave up and went to the docs again. Was prescribed ranitidine, which helped to start with but we had to change the dose all the time (we-I mean the GP). We were eventually given omeprazole and I think it was the best for us.
I was so sad though, similarly to you, that my DD was such an unhappy baby and there was nothing I could do about it to change it. If I could turn back the time, I would have put her in a carrier straight away (she hated the pram, but I only got the carrier idea after 3 months of suffering!), I would have gone dairy free much earlier (for some reason, I was really worried about not giving her enough calcium-silly me!). If you are trying to go dairy free, I would give it a good go (at least 3 weeks) and maybe go soya free at the same time? I know it's hard, but really may help... I find KARA Coconut milk is the closest in taste/sweetness to cow's milk and I got used to it so much that I still use it, even though my DD is so much better and I (think) I am ok with dairy (although still a bit cautious).
I know what you mean about being a human dummy-I went with the flow (but then I didn't have other DCs to worry about), but she still as a happy (and still BF toddler) is very sucky and finds it comforting to suck to sleep etc. It may be a reflux thing? Or a temperament, I am not sure.
I hope you feel better soon and your DD does too. If I could recommend anything, I would really try and push for reflux diagnosis, but you may have to go to several different GPs (I went to 5 before one treated me seriously!!).
If there is anything you'd like to ask about or just have a little rant, feel free to PM me. I haven't got any experience of bottle feeding, so unfortunately can't give any advice on how to get her used to bottles, if this is the route you'd rather take. Anything to save your sanity, really! It;s so hard, I was a recluse for the first 5 months, because I was so jealous of all these contented friends' little babies who sttn from 4 weeks...
HUGS!!!!!