2 under 2 and single! help.

One of my daughters was born 24 wks premature. She weighed a pound. She was finally taken off o2 and begin to eat on her own 10 months ago.and 6 weeks ago I just gave birth via c section to her full term sister. I am emotionally all over the place. Sleep deprived. My preemie has sensory processing disorder and develop ment delay. I feel like I am being pulled in 2 different directions at the same time all the time. It takes me hours to get us all ready and out of the house just to go to the grocery. I can never get anything done. Any moms out there know any tricks or tips who have more mom experiance than me? PLEASE. I am a single mom and ready to pull my hair out!