Bilblio & MFO-
When I returned to work with DS (which was full-time) and more recently since DD goes to a friend 3 mornings a week (so I can study) I managed to juggle bottle & breastfeeding pretty well- so please don't feel you HAVE to stop BFing. With DS I still did the evening feeds every night before his bedtime (and he often still needed 1 feed in the night too) and usually the early morning feed...although once he was 8 months that became to late in the morn (after 8am) for me to BF then get him to nursery in time to start work.
I started off expressing every lunchtime at work in a bid to keep my supply going, but after 6 weeks found it too inconvenient with meetings etc. So from then we just kept going with 1-2 breastfeeds each day at home and DS had formula during the day at nursery. This we kept up for a further 3 months, and finally stopped (gradually peetered out) when we both felt more ready at 10.5 months.
With DD, she has a bottle once a day to make sure she doesn't 'forget' it. I try to make it the same time each day but sometimes it changes, and some days I get it wrong and she's taken so much from me while BFing that she doesn't need her bottle- but we never go more than 2 days without her having a bottle or I know (from hard experience) that she will start to refuse it as of course she prefers the boob!! I think once you have managed to introduce the bottle you do need to keep going with it at least once a day. If you are using formula, which I am (as don't have time to express) and you give the same amount daily your breastmilk supply will adjust accordingly and you should still be able to feed a few times if you want to. You can keep breastfeeding even with one feed a day for a LONG time so long as you don't miss more than 2 days of feeding... So it really is up to you. Like you both said I felt too awful at first to stop feeding when I thought I would, so I found it better for both of us to keep going even with just one feed a day until DS (&DD) were older. I hope to BF DD until she is over 1 year old, even if only 1 feed per day, partly because it has lots of health benefits for CF babies (but I might change my mind if it gets too difficult....e.g. if she bites!!! ).
Hope that long ramble makes some sense.... I used to look forward to the bedtime breastfeed all day at work, as it was such a lovely close time with DS and made me feel better!! Going back to work is so hard, try not to put too much pressure on yourself and be open to changing your plans about EVERYTHING! I need to work for my sanity, though found full-time work very tough and now I don't have to (change in circumstances) I have no intention of doing so until both DCs are a lot older... But will keep working part-time...
Huge hugs to you all, night nigh xxxx