Sorry to hear that you're having a tough time.
I just tried Sinoclear drops to help clear DD's snuffly nose. I found them in the supermarket and they seemed to help.

I remember combindation feeding DS1 because he was a reflux baby and didn't stay on for feeds before screaming blue murder. There was this special teat that I bought from the breastfeeding clinic that I attended where you can alter the flow of the EBM or Formula so that they don't get an 'easy bottle feed' and then kick up a stink when back on the boob and having to work for a let down. It was a longer teat and had three marks on it and depending on which mark was lined up with the middle of their lip, they either got a fast, medium or slow release. There was a bit of a trick, learning to use it, but the bottled milk wasn't thrown down his gob, like most conventional teats
Not sure what services are available in Perth - could be worth calling your hospital re: the nearest breastfeeding clinic, which should hopefully bulk bill for a day visit (?)