Oh it's awful having twins, I remember the creeping through minute by minute, feeling sad and guilty I wasn't enjoying the babies as much as I would and could have if only they had come with a few years gap between them.
It's really hard work.
Are you a member of TAMBA? There is probably an online meeting these days. Other parents of twins similar age to yours are your best hope of sanity.
The days will pass. They will grow up and become less demanding of every fibre of your being.
Share as much as you can with their father, grandparents etc.
We had a rule that if one woke up, we'd wake the other, even tho it seemed madness it did mean we had a few minutes when both were asleep.
The car was our lifeline. When you can't cope, go for a drive with them and they will sleep.
Sleep or just lie down when they sleep. Sod anything other than baby care.
Tv is a great life saver at times.
Finally it does not hurt them to cry. Leave them to cry if you know they are safe and can't get out, if you need five minutes alone.
It passes. I miss my twin babies now they are young adults.