DeepFeet- HUGS! Just to let you know 3 oz is really good! Are you using a double electric pump? Are you doing breast compressions while pumping? I have to pretty much squeeze my breasts hard the whole 20 minutes or not much comes out. It really helps.
I've been exclusively pumping (unfortunately) since DD was 1 month old. She's now almost 9 months. I used to pump 8 x day and at 2am, even thought DD slept through the night regularly, up until she was 6 months old. Even now, after 8 months, I only get 1 oz/hour. So now I only pump every 4 hours and get 4 oz. at each session and 8 oz in the morning after not pumping for 9 hours, and that's with taking Domperidone to increase my supply. So, I want to pat you on the back for nursing AND still getting 3 oz! That's great and should be enough to leave for a bottle while you and DH go out. Or if you do that twice, then you can be gone for quite a bit of time. When DD was that age, she drank a bottle every 2.5-3 hours. (bottles of milk are more filling than nursing. A lot of babies nurse off and on and "snack" since they can control the flow of milk. With bottles the milk drips out continuously and they drink more at a time and it keeps them fuller longer- that's one of the bad things about bottle-feeding. I recommend only using the slow flow newborn nipples on the bottles because that is at least closer to the harder sucking and slower flow of nursing. Or you can get the breast-flow bottles that is supposed to be the closest thing out there to nursing. I know you didn't ask for this info. Just throwing it out there).
I second the high water intake and oatmeal (steel cut oats are best). There's also mothers milk tea and fenugreek that can help.
I don't have any advice about the weeping. Do you think it's because you don't want to be pumping and feel stressed about producing enough? I know that the ability to produce for the pump is very much tied to emotions and stress. Relaxing, picturing water falls of milk or a fire hose spraying milk helps a lot. I thought it was silly, but it works. Also, I really recommend making your own hands-free pumping bra if you don't already have one. Just cut nipple holes out of a stretchy sleep bra. Voila! Then take the pumping time to read a good book, or catch up on MDC and just relax. It really helps.
About going back to work- There is a ton of info on the kellymom (the forums, not just the info site) about how to build a stash for returning to work and the weeping. Those women are SO helpful and you'll probably find your exact situation already discussed there. Since I EP, I don't know the logistics on when to pump and when to nurse, sorry. But I do know that your babe is much more efficient at getting the milk out than the pump and will most likely drink less during the day and nurse a lot more at night. So, you'd be pumping while at work (I would do every 2-3 hours) and then those bottles are for the next day and you nurse all evening (and night, probably). Make sense? Like I said, I don't know the logistics of that, but I know it's definitely doable. Hang in there!