E.S.
I feel your pain!!! I have a 25 month old little boy, and he only started sleeping through the night at about 18 months. Then at about 22 months, he started having Night Terrors :o( They are HORRIABLE! What I do with my son is just sit next to him, and rub his back if he will let me. I talk to him very calmly and tell him that mommy is there and that I love him. It is so hard seeing our babies go through this! Also, what helps for us is that we go in his room and start trying to calm him as soon as we hear him start to whine. We have found that the terror either doesn't happen, or it is much shorter.
Good luck!!! and also, If you can get the two asleep at the same time, even for 20 min... TAKE A NAP! Everything can get done at another time :o)