S. - I saw your summary and the comment about wishing you didn't have to go back to work so soon. See if there is anything you can do so that you can have more time with your infant. Maybe a flexible work schedule (4 - 10 hour days) or maybe working from home a day or two per week? When I first went back, I worked in the office Monday, Tuesday, Thursday and Friday and worked from home on Wednesday. That meant I never had to get through more than 2 days of work at a time.
After I had been back 6 months, my husband and I decided we would all be better off if I accepted a part time position (3 days per week) and I took the first opportunity that came along for part-time. We've cut back on almost everything (no take-out, no restaurants, no Blockbuster, "staycations") but we are doing fine and much more relaxed and happier. We are going to keep at the part time as long as possible. I love being able to maintain my career, and still have my days where I am the stay at home Mom. I belong to a mommy and me group and my son has the benefits of 4 days per week with either Mommy or Mommy and Daddy but also the benefits of 3 days a week at a pre-school that he loves.
Just something to think about...it took me 6 months to find that part-time position but even the knowledge that it would happen eventually made working full time something I could survive.
Best wishes!
S. - I feel your pain. I was a 34 yr old first time mom, and I breastfed my son exclusively to 6 months. He was a smallish baby (5lbs 8oz) and didn't sleep through the night without a feeding until he was 20 months old. He couldn't go longer than 4 hours until he was about 4 months old. Then he got closer to 6 hours. My doctor said that since my son was smallish to begin with, he was just hungry and that it would not be right to withhold food. Many doctors will tell you to stop giving a bottle at night at 12 months, but mine said if he is hungry, then he is hungry and I truly believe that he slept through at 20 months because that is when he could (8pm to 6am).
I must be crazy because my son will be 3 next week, has been a great sleeper since 20 months and we are TTC #2, I am nearly 38...
Good luck!