I completely understand where you are coming from. I have been riddled with guilt from the beginning, even though I did manage to tandem feed I just couldn't hold them as much as they wanted so there was still lots of crying. I think guilt goes hand in hand with having multiples - unless you have another person with you helping all day and night. Mine didn't even like the pram much so I couldn't easily soothe them both that way.
I would have thought that expressing to add a bottle is going to tie up your time even more, so trying to get them both feeding in tandem would be a more efficient solution. Can you get the BfN or someone similar to come around to your house to have a play around with pillows to see if they can help you get a system worked out for feeding them both at the same time? The BfN are very active in my area so I lent heavily on them, but maybe La Leche or even the NCT??
Can you see if you can borrow and Ez-2-nurse to see if it works for you? (Some people like it others don't, so you may not want to waste money).
When I did it, I had a V pillow around the front of me and then I put a pile under it around to my left and right and a single pillow resting across my knees. That kind of raised the V pillow up evenly so that it was horizontal. I had to pull the pillow very close to my body to avoid the babies falling into the gap.
I got the babies onto the pillow fairly close to my nipples but further round towards my armpit. Then I would undo my bra and put the poorer latcher on first. When she was on, the t2 was only a few inches away and I was able to pull her into position (she was a good latcher so I didn't need too much fiddling, thankfully). My posture was usually far from ideal, in that I often had a rounded back as I brought my breasts down to the babies rather than vice versa, but it got me through a tricky phase.
In a little while you should have more flexibility with positions as their spines get stronger. The jockey position is one I preferred - one stradling each knee, facing me. There are some weird and wonderful positions in the photos "HERE [[http://www.karengromada.com/karengromada/photos/index.htm"
I don't know if you have other children, but if you haven't things get dramatically easier in 3ish months time when their feeds get quicker and they are able to handle waiting better. At 3.5 months I ditched tandem feeding for the most part except for emergencies.
I can't read any articles about the damage of controlled crying because I know how much these two had to cry in their early weeks and I feel awful - even though I know there was absolutely nothing I could have done.
Oh, a further thing. If you have other children or even if you don't, I got a mother's help to come in from 4-7 (she was a student at the local uni) and she was a godsend. That was one period of time when noone cried as well as laundry, tidying and food got done.
I hope you have a better day today. You are not alone.