Baby blues?

I gave birth to my second son 3 days ago. We had a 60 hour hospital stay because labor was long, and there was an issue with babies nose (one nostril never opened). We're home now, but all day I've been fighting the urge to cry. I feel helpless, and like I'm not doing enough for my newborn and 3 year old. I'm not extremely sleep deprived, but I'm also not getting enough sleep... my breast are so engorged, and my stitches from birth are still very sore. I know it takes a few weeks to get into the swing of things, but I'm restless and sad and bored and just can't handle all of the emotions at once. My husband is home for now, but he returns to work soon and I'm so scared of being alone with my two kids- I feel like I can't do it. I'm stressing myself out, and I don't know how to stop. I guess I just need to vent, but is there any way to fight the baby blues?