Eefs - I remember that stage so well - it does get better though, honestly.
I'm not hugely knowledgable on supply. The only time I expressed through the night was when my supply started to reduce and for a couple of nights I got up and expressed 3 times in the night. The rest of the time I didn't though, just did it very late and then first thing. I do know that lack of sleep is likely to affect your supply though, maybe try cutting it out and see what happens. Also, stating the obvious, maybe, but easy to forget when you have a little one - make sure you are eating properly.
Try not to plan too far ahead - just handle a day at a time.
My ds is wonderful now He's a very bright, articulate and happy little boy. We have annual check ups, with all the various different departments, but otherwise it has no effect on our lives. The next operation will be sometime when he's between 7-9. After that, who knows?
As soupy says, the NCT hire out electric breast pumps, but I borrowed mine through my midwife. FWIW, it worked initially, but then I switched to just expressing by hand, which I found far more effective longer term.
And I meant what I said before - if I can help in any way, let me know Thinking of you.