Yowza! I'm a fellow mom of twins and I still had to read your post twice just to follow your evening! Sooooo busy! Lots of ((((((((((((HUGS)))))))))))) to you!
Like above pp, I didn't work at this stage, so I first of all want to commend you on doing all you're doing. It's really tough not to have enough money or time, and added to that the twin sleep deprivation thing is almost unbelievable even when you yourself are going through it.
I do have some suggestions which I'll throw out and if any work for you or give you some ideas, then great! I also agree with above pp that your life is just about to get easier. At six months things really start to turn around. You won't have blurry vision from exhaustion too much longer, really. And you will get one, then three, then five, then 10 or 20 minutes to (gasp) eat, pee, and possibly even SHOWER!! It really will happen, please hold on to that hope from those of us who have been there.
OK now some ideas that may help (or not, I know how it is, sigh...):
1. Make a nursing nook close by the bed they sleep in. This is worth a weekend and bringing in neighbors to move furniture. The idea of nursing them to sleep on one floor and then trying to move them to another gives me the willies - sooo hard! We put a love seat very close to the bed and I practiced during the day moving them from pillow to crib and later our bed, without waking them up. Yes it took 1-2 hours to get them fast asleep enough to move but the trip was a few steps rather than an entire floor. This is worth rearranging your house for, promise.
2. Dittoing what above poster said about family bed! As soon as you feel able, bring the babies into bed with you. We put a single mattress next to a Cal King mattress on the floor, got Safety 1st guardrails at Walmart, and got the following arrangement: wall, dad on single, Alicia, me, Annika, guard rail. The other guard rail is at the head of the bed so Alicia doesn't roll off (she's a thrasher, he he). You absolutely cannot believe how much more sleep you will get. You can turn from side to side to nurse them all night long and barely wake up. It's a miracle, it really really is. Then, as pp said, you can switch them to the other breast during the daytime. If you're like me you'll still have to get up and put them on the nursing pillow when they wake up at the same time for a while, but it's so much easier to attend to them starting from the same bed. And having the nursing area a few steps away makes your commute in the middle of the night that much easier.
3. During one of those endless nursing sessions, think about how you can re-do your routine to avoid those early evening trips to the grocery store. I don't know enough about your routine to suggest anything specific here, but if you could arrange the grocery trips some other way then that would free up that time in the early evening.
4. You may not like this one, I don't in retrospect but it worked. For about the first six months I ate almost everything wrapped in a flour tortilla. I would have someone else make something (or cook it in a crock pot so there's no fuss - chicken with mushroom soup; chicken with barbecue sauce; chicken with salsa; chicken with... you get the drift). Then either they or I would take two seconds (ignoring the inevitable screaming - even Mothering mag says five minutes of screaming doesn't damage them emotionally and they don't usually write about how to deal with twins!) to wrap the food in a tortilla, balance it on the edge of the nursing love seat, latch the girls on, and munch. Not private, not gourmet, but I got full. And I also kept lots (like five) of bottles of water on the love seat.
Just to let you know that one day it will end - my girls and I finally figured out how to do all our nursing-to-sleep in bed together, at 13 1/2 months! Tomorrow at LLL meeting I plan to bring my EZ2 Nurse pillow out (I host the meetings) and have a small retirement ceremony for it. Sniff...
Hang in there, hugs, it will get better soon!