Huge hugs to you hun. I don't have solutions to offer I'm afraid but I just wanted to offer some hope. DD's sleep followed almost exactly the same pattern. Brilliant 'till 5 months and then gradually deteriorated 'till by 8 months she was waking 3-5 times a night and was a nightmare to settle / resettle. We haven't really changed much (apart from adding a few little tricks which sometimes help her get to sleep like a particular toy or when I jiggle her a particular way) but on her own she's gradually started to get better. She still needs to be rocked to sleep but she's resisting it less now so it usually takes abt 10 minutes, and now she's back to waking 1 or max 2 times a night.

It WILL change. I hope so much that it changes very very soon for you. Sleep deprivation is torture. Sending you lots and lots of ZzzzZZZZZZzzzzzzzZZZZZzzzzzz's!