I have a 3 1/2 month old son, and felt much the same at the beginning of my maternity leave. All he did was eat, sleep, poop and cry. I would serve him round the clock, and it was very one sided. I felt like a prisoner in my own home - a slave to baby, dishes and laundry - not to mention my new gross body.
The first 6 weeks were the hardest, and I cried a few times, and there were a couple of days when I thought I might lose my mind. (being overwhelmed & sleep deprived will do that).
Then he started to look at me. Then he smiled. Every week there was something new, and now it seems like everyday there's something new he's learning, doing or noticing. It's splendid - motherhood is the best job I've ever had!
As for you ... what to do with your day? I don't know what motivates you, but I'll tell you what helped me.
*GET OUT. Even once a week out with friends, shopping, running errands, garage saleing, whatever the reason - if I got out of the house and spent time with another grown-up, I didn't feel so chained to baby. Until he was 2 1/2 months old, I would get someone to watch him for 2 hrs a week just so I could run errands.
*NAP. When he sleeps, you can sleep too. (and should at least during one of baby's naps)
*EXERCISE. Get a video, walk, join a gym, whatever works best for you. Eating well and exercising will help you feel better, and will help those extra pounds drop off.
*DON'T WORRY. The house doesn't need to be perfect, the meals don't have to be exquisite. The most important thing is that you're mentally, physically and emotionally fit. Can't take care of baby if you're falling apart with stress.
*DO STUFF!! If you're worried about becoming lazy, the key is to be active. Boredom is exhausting. Keep your head busy with planning (baby plans, schedule plans, house, garden, visiting, excursions, dates, whatever) Take time to do stuff just for you. Just once a day ignore the dishes and laundry, and phone a friend or scrapbook or write a poem or story. Draw or paint, plan your dream house, take a bubble bath. Whatever you enjoy(ed), you should still do it. Oh - keeping a journal (even monthly) of your feelings & changes as well as baby's changes will be helpful too. It will help you note your own progress. Then you can look back and see how far you've come - all of the problems you overcame, the way your baby is growing.
It gets better - way better. Soon your son will smile at you, and become playful. He'll become much more interesting. That will help make it easier to 'hang out' with him. Also don't be afraid to leave him on the floor or in the swing or carseat by himself while you do stuff. Keep him in a place where he can see you if you like, but go on with your life. Life needn't end because of a baby. Besides - I think it's good for them to not be held all day every day. I hold my son, but he spends alot of time in a swing, carseat or on the floor playing with toys. I talk to him, and come and play with him while he's there so he knows I don't forget about him, but how else is he going to learn that being alone is okay, and playing with toys is fun? He won't learn that on my lap, and I don't get anything done that way either.
Anywho, time to end this novel. Hope it helped.
