Is there another way for you to 坐月?? I can tell u for sure if you 坐月 at your 99's house, you will have depression. How about your parents?? Do you have a maid/helper that can help you?
I used Medela electric pump last time and it worked just fine for me. I can get at least 4oz everytime, sometimes 6 - 8oz tim !!
I think it really depends on how often you let your baby suck on your nipples, the more you let your BB suck your nipples the more milk you'll get. I usually let my daughter suck my milk but because I produce quite alot and it hurts so I pumped it out and let my husbund help me feed her while I sleep (that can make your life easier also). Sometimes when you pump and you find you have less milk coming out, try to look at your baby's photo, this can stimulate your brain to produce more milk.