BTCIT, how much domperidone are you taking? The max dose recommended is 160 mg a day - or 4 pills 4x a day. I'd recommend bumping up to this asap if you haven't already as it's really the most effective galactogogue at your disposal. It can take up to 4 weeks for the effect to be seen, so keep going. You may get a headache when you start it but it will go after a couple of days.
You can also add in fenugreek - take I think 16 capsules a day. If you don't smell of maple syrup by day 3 you're either not taking enough or it's not going to work for you (it doesn't for me). You can try fennel tea - I like the taste but doesn't seem to have a big effect. Also 'more milk' and 'more milk plus' herbal supplements which you can get from www.expressyourselfmums.co.uk .
Re expressing, do get a hands free pumping bra (can get from website above) so that you're not stuck too much while pumping and can feed your dd while you're pumping. Get yourself on a pumping schedule - every 3 hours minimum for the next week or so then you might be able to cut down. Power pumping can help boost supply. Pump for 10 mins, rest for 10, pump for 10, etc. I do this in the evenings so DH can bring me cups of tea etc!
You also don't have to sterilise your equipment every time - just put it back in the fridge in a plastic bag, and wash and sterilise once a day.
You can also get milk from a breast bank if nne of this works. But remember, even a few mls of breastmilk will make a big difference, so it's worth persevering a bit if you can stand it.
I totally understand feeling bereft, I'd give anything to be able to feed DS 'normally', but it's just not going to happen for us, so I do the best I can. If you are feeling low, you might want to join the MOBI (mothers overcoming breastfeeding issues) yahoo group where people really understand what it feels like.
Good luck!