My husband is returning to work at the end of this week and the grandparents will all be gone.... Does anyone have any tips or recommendations on how to survive the first weeks alone? I'm still recovering from my c-section so my strength and energy are not what I usually have, and I'm not sure how I'll find time to cook and eat and feed myself, etc., after I've made sure that DD's needs are met....
DD feeds every 3 hours with an hour to feed, an hour to play, and usually less than an hour to nap. I'm just not sure how I'll survive alone. 
Re: how to survive first weeks alone?
1. If you feel a cry coming on...lay the baby down and cry it out!
2. If youre about to lose your mind, dont be afraid to make DH come home for lunch so you can have an hour to yourself.
3. When DH comes home from work let him care for the baby for a few hours so you can do what you need to do.
4. Dont be afraid to call someone to come over and help
5. Keep your spirits up..on some says when I was about to go crazy I tried to just smile and act happy..and in the end it actually made me happier!
it turns out i actually like my days alone with my baby. i was really emotional and worried about it after having help the first 3 weeks.
Frankly, I recommend giving up on the eating and cooking.
  Be sure you have some easy-to-eat stuff handy (bananas, soup-at-hand, etc) so you can get some nutrition.  Then make DH cook when he gets home from work.  Make sure there are plenty of leftovers for both of your lunches for a couple of days.  
Eventually, you can take over the cooking duties (when you're more healed and the baby is slightly less needy). Even better, get takeout, get the ILs or friends to make you some freezer meals, and give up on house cleaning, except for the really important stuff like toilets (which can be done on the weekend - one of you cleans 'em and the other has the baby).
Good luck! It's really not so bad.
Well as far as food goes try freezing small meals and stocking up on easy things like cold cuts, fruits, and maybe some ensure or something similar. House work goes out the window! LOL! Try to prepare your food while the baby is eating. That way when they are finished and playing you can eat. (trick I learned LOL!)
Just take it easy and when hubby gets home he should tend to the baby at least the first 2 hours. That way you can get some much needed you time. That's all I have - I think it will be a little easier for me b/c I will bottle feed. Take care.