Hi emmam - sorry to hear you are having a stressful time. I remember being very upset by the same issue many moons ago (DS is nearly 3 now). I know it must be making you really unhappy, it's awful to feel you can't feed your baby in the way he needs. However, you've got a few weeks and you may get there. Here's my top tip which I've dispensed may times now to women having the same problem and most times that I've shared it I've heard back a while later to let me know that it worked.
I found, with my DS anyway, that this trick helped him to get the hang of bottle feeding. The problem, as I understood it later, was that every time he had had milk from me, throughout his entire life, he was being cuddled by me in a particular way that he was used to, sideways on and facing me. He had no experience of feeding in any other position. When I tried to bottle-feed him, I was holding him on his back in the "normal" bottle feeding position. He didn't associate this position with being fed, and didn't understand that the thing I was trying to put in his mouth would feed him. He was hungry and cross and not ammenable to suncking anything that wasn't my breast.
I used the tommytippee bottles that have a wide, breast-like teat and a small, squat bottle (but other women have used the same trick with other bottles). I slipped a bottle of blood-temperature milk on its side, inside my clothes, basically in my armpit with the teat as close to my nipple as I could get it. I then held DS in the normal breastfeeding position, but with my own nipple covered with cloth and the bottle's teat by his mouth. He latched on to it happily then.
After a week or so of feeding like this, I started to remove the bottle from my clothes mid-suck (without him un-latching) and let him carry on sucking in a more normal position - this enabled him to start recognising the look and feel of the bottle as a normal thing. Eventually he started recognising the bottle for what it was, and no more subterfuge was necessary.