In a word...patience. I know it's really stressful. I have been right where you are. But, the fluctuation in supply and pumping volume is normal, especially in the beginning. And, to make it worse, stress plays a big role in the whole thing. So, the more worried you are about it, the worse it will be. I often had a 4 ounce morning one day, and then a 0 ounce morning the next. I almost never got much in the evenings, so once I was able to get a bit of a stash, I stopped pumping then.
Hang in there....LLL will have some good advice for you, I'm sure. And it hasn't been that long...give your body time to adjust to your new demand.