Do you have an oversupply? Probably a very easy thing to experience if you have twins.
Make sure to feed on demand, not on a schedule, and feed your babies as long as they need to eat.
And, if possible, see if your husband can stay home for a bit to help out! If this is not possible, look into getting a doula who specializes in postpartum care. Doulas help around the house as well as give bf and other baby care support.
I'd get a LLL volunteer to stop by, as well.
Basically, get as much support as you possibly can. Be really proactive about lining up visitors to come by to do laundry, drop off food, dust, vacuum, do the dishes and everything else you can think of. Don't be afraid to ask. You need a lot of help right now. It is extremely important that you take care of yourself right now. Whether the mastitis is recurring or due to fatigue and stress (suppressing your immune system response), it's a sign, I think, that you have more on your plate than you can handle right now.
I'm sure that you and your family will get the hang of this.
Are you nursing your babies in bed overnight? This might help. Your husband might have to spend some time on the couch to make sleep sharing with the twins safer. Let the man sleep on the couch, and basically just go from one side to the other; this way, you can sleep or at least doze while your babies nurse as needed through the night. Same thing with naps. This way, you can get them napping on the same clock, and you can catch up on sleep, as well.
Good luck. I really feel for you. You'll get through this!
L.