OH OP my heart goes out. I haven't RTFT but didn't want to read and run
I have BF twins. Its HARD. I did it though, partly becasue I already had one baby and had BF ok so I knwo what I was doing up to a point ;-)
My advice is firstly to speak to someone who really knows what they are talking about - midwives DON"T always know about BFing and only get short training, and won't know about twins.
I did breasfteed successfully but I must stress that I didn't try and feed to a schedule, adn I really didn't try and express. With one baby expressing was hard enough as it never gets as much out as a baby who has learnt to latch properly. It also takes much longer, and is much more effort. You are no likely to get enough out easily. Much better to try and sort the latch and technique out.
Please contact La Leche League or your local breastfeeding gruop, or if you can afford it a breastfeeding consultant. You can try lots of different hold to find whihc suits - have you tried the 'rugby hold'? You need someone to help you get set up with cushions supporting both babies for this.
Also tehre aren't any 'rules' fro BFing twins - people will tell you all sorts of stuff about which boob to do first, what schedule, whether to do both at once or not. The answer depends on you. I often did one at a time - which was also great for bonding with each baby. I did crack both at once and did that too; in lots of different positions.
I spent a lot of time in bed with them feeding. I managed my expectations about getting out with them (basically I only attempted one thing per day - baby group, post office, doctors, supermarket - only one of them). I ate loads - hunger appeared from nowhere when they were feeding well. I had a lunch at 11.30, and another at 2pm! Never sit down to feed without water too.
And get a referral for postnatal depression if possible.
Best of luck