Hi Jay9
Just wanted to add: don't beat yourself up about loathing the job sometimes. It is possible to be totally & passionately in love with your little baby, but still hate the routine, exhausting, mundane & yukky parts of the job.
One of the most helpful things someone said to me was that Nature arranged it so that just when you thought you couldn't take any more of this slog, your baby would do something new - focus on something, reach out a hand, smile, roll over etc. And that really does help.
Another thing I found useful was a book by Naomi Stadlen, called something like "What Mothers Do [when it looks like nothing]" - which is excellent in helping you be more aware of all the recent changes to your life/body/relationships and how you may be feeling about them.
Mumsnet was also great when I had questions to post about daytime sleeps. My DS (now 1) and I were often both reduced to crying when I tried to settle him for daytime naps at about 16 wks. Controversial as this may be, I started to wean him at 20wks (he was a big boy - 10lbs 2oz at birth, and BF till that point), and noticed that he was more settled within about 3 days. Other mums notice no difference, others will say it made things worse - but whenever you do decide to wean your little one - in a month or two or whenever, you may find things a little easier.
Also, once they go a bit longer in daytime naps, you can try to set aside half hour to read a book, check your e-mails, whatever YOU want to do - and still have time to clear up their mess and eat something!
Before I had DS, I had always worked full-time outside the home - but I don't think I had ever worked so unremittingly, day after day, 6am-9pm, 7 days a week, without a holiday, and so little positive feedback. However, all that effort you are putting into this new job will pay dividends when hopefully your wee baby grows into a happy, well-loved and cared-for child.
I still have days when I would love to be back at work, but more days now when I thank my stars that I can spend the time I do with my DS. We have passed many hours on pointless walks, hanging out at babygroups where we know no-one, and singing nursery rhymes for the nth time - and there is no-one else on the planet for whom I would do all that... so it must be love!!
Good luck.