I had to go back to work when dd was 11 weeks old and I was completely driven to continue to bf her. I loved doing it so much and she was always so content. I pumped 2x a day, plus I ran home for lunch every day (until she was about 11 months) for her to nurse. It was kind of a crazy schedule, but I wouldn't change it for anything. Getting to go home and have her nurse made my day so much better and I knew that she was more peaceful. She never really liked the bottle. AT most, she drank about 6-7 oz when she was little. She nursed a lot when I came home for lunch, after work and throughout the night. We also demand nursed on weekends and days off. Around 11 months, I dropped the pumping and only did the lunch nursing, but she wasn't too interested. At 12 months, I tried giving her cow's milk, but she wasn't into that either. So, now we nurse in the mornings, after work, bedtime and throughout the night. During the day, she's offered cow's milk, but will only drink a tin bit. She waits till I'm home and them fills up on bbm. She'll be 14 months in a couple of days.
My mom showed a lot of skepticism when I told her that I would continue to only give dd bm, despite going back to work. I was really insulted that she thought I couldn't do it, which is part of the reason that I felt so driven to succeed (plus that it was so good for dd). In hindsight, however, I think that she was just puzzled how I could continue to do it b.c she didn't have breast pumps when she was bf me (had to manually express) and she didn't have the luxury of being able to come home to nurse. Thank goodness times have changed. Otherwise, I don't think I would have been able to do it.
Kudos to you for sticking to it for so long!