D.P.
What you're feeling in completely normal! A few thoughts:
I know it didn't work out this morning but CLING to and KEEP that extra hour in the morning. It helps. It always does for me (my son is 7 now and I still get up before him!)
When hubby gets home from work, retreat to your bedroom (or the bathroom, if necessary!) for 15 minutes of peace and quiet. 15 minutes is not going to hurt anyone and it will help you!
Every other Saturday is officially Daddy/Park time. Send him. He can do it if he has to and once he sees that he can, he will!
He "wouldn't let you" go to the grocery store til the baby was asleep? !!! ??? Uh-uh. Next time GO and turn off your cell. He can deal for an hour or 90 minutes.
2 year old not napping? She can have quiet time for an hour the SAME hour as O. of the baby's naps. In her room. Quiet. As long as there aren't explosives or knives in there, she'll be fine.
Good luck!