I totally understand. It is not only harder with an older child because of the extra work but the guilt of not being able to do as much with the twins that you did with the singleton and the guilt of not remember whole periods of time- that is really hard too.
I does get easier. But, it will never get as easy as it was with the singleton. It just gets easier in a different way. somehow. The work is double but so is the joy. When they are all running around the house giggling and chasing each other, it is SOOOO CUTE. It feels so special. If you can, think about how rare twins really are and that you are witnessing/experiencing something special.
But yeah, the point you are at right now is extremely hard.
" I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent." Mahatma Gandhi
"This is the ultimate weakness of violence: It multiplies evil and violence in the universe. It doesn't solve any problems." Martin Luther King, Jr.