Mom of toddler and newborn and going INSANE:( HELP!?

Ok, my husband is in the military so is currently not here. I just had a baby girl about two months ago and I have a 2 year old. So needles to say, Im doing it all on my own.. everything.. I take care of whatevre needs to be done, the house, groceries, bills, ect. Anf of course the kids. I do pretty well on most days. Iv learned to use my time evenly among the kids and chores. However.. there is never time for myself anymore.. in fact, I don't sleep more than 3 hours each night.. my newborn does not sleep well at all! Shes can so discontent sometimes.. And my toddler still does not sleep all night so im up all day and most of the night with them.. i have days (like today) where I honestly feel as though im literary crazy.. like i have taken so much responsibility to handle alone that I am slowly driving myself insane! I love my children very much, as hard as it is I couldn't live without them here with me. But sometimes i am so upset, irritated, and exhausted that I quiet frankly want to be anywhere but here.. sometimes I just wish I had someone to load them up and take to because I have had all I can take of them at that moment.. I feel terrible to feel this way but I do.. I honestly feel like an awful mother to them sometimes because I become so frustrated from lack of sleep, time to myself and adult company that I just want to run and get away from it all.. my newborn hardly sleeps.. and I have days where I can't take another minute of it and I get so frustrated with her and it causes me to not be as soft spoken and patient with her.. I start grumbling at every noise she makes.. how on earth can I fix this?? I love my children but I have got to sleep and have me time every so often as well.. how can I be more patient when im doing it all alone??? Am I honestly an awful mother for grumbling at them when im frustrated and have had enough...? What can I do to kick that habbit and find a new way to deal with my anger and frustration?