It is possible to get your milk back. Google "relactation" and you'll get a few hits. Check out this link on http://www.kellymom.com (which is a fantastic breastfeeding reference): http://www.kellymom.com/bf/supply/relactation.html.
It sounds like you still have milk, but maybe not that much. I'd try nursing instead of pumping. You shouldn't gage how much milk you have by how much you can pump, it's misleading. Babies are much more efficient at getting milk than machines. Nurse and nurse often, pump if you miss a nursing session. Drink plenty of water. You might also want to try eating oatmeal every morning, it helps produce milk.
Some people will recommend fenugreek. I'm very leery of herbs, you should do your research before trying it and talk to your doctor. You can't take it if you have certain health issues, risks, or take certain medications. Herbs aren't regulated by the FDA, so you never know what you're going to get. Here's a link on fenugreek: http://www.kellymom.com/herbal/milksupply/fenugreek.html
You can also get a prescription from your doctor to help with your milk supply.
You might also want to check out the Le Leche League: http://www.llli.org/WebUS.html. Contacting a lactation consultant would also be a good idea. If you don't already have one, your doctor can probably recommend one, or the hospital where you delivered probably has one on site.
Hope this helps. Good luck!!