Hi J.,
Hang in there, it does get better. Postpartum was terrible for me with my son (I have a son 2, and a daughter 11 months). I cried everyday and was too tired, too stressed, very hungry (never had time to eat) and scared not only that, I wanted to clean and couldn't, I couldn't take a shower when I wanted or needed it. But, around 6 weeks, you start feeling better and by 2 months you should have a "normal" or familiar routine with your baby and things just get better from there.
I remember not wanting to leave the hospital because I was so scared of being home with the baby. My husband thought the "maternal" instincts will kick in for me as soon as I gave birth, but I was horrified. No one ever talks about the fear and the emotion a new momi goes through when the baby is born and is home for the first several weeks. I didn't think I would go through postpartum when I was pregnant, but it's hormonal and it effects everyone differently. It's helpful to know that other moms have gone through this and with understanding from a spouse and/or family and friends a new momi can get through this.
I hope this helps a bit. If you want to reply with questions or comments or just to vent. I'll be here to listen (or read in this case).
Take care, rest (if you can), EAT and know that it does get better with every passing day.
And don't worry, when your baby is hungry, he'll let you know. Both my babies also went like 4 or 5 hours with out waking up (in the first few weeks) at times. I woke my son up all the time, but with my daughter, I let her rest until she told me she was hungry.
Barbara