A similar thing happened to me - my daughter preferred bottles over me when I introduced them for work, she went to full time bottles by 10 months. I also was a crap expresser and it was painful and hard work. My son seems to be going down the same way even though he didn't want a bottle for ages
Things you could try:
switch pumping (do one breast, then the other, then back to the first and so)
motilium - need a script from your Dr
oats for breakfast (some swear by this!)
Good Luck, it is so stressful isn't it??!!