{{{hugs}}}
I had a stomach bug when DS was about 11 weeks, and my milk also seemed to disappear. He would cry hungry an hour after feeding then feed for ages. I pretty much stayed in bed for a couple of days and just fed him as much as I could - I finally mastered the art of feeding lying down! After a couple of days my milk was back to normal, and I went on to feed DS for nearly 18 months.
Is there someone who can come and help with #1 so you can concentrate on feeding #2? The very best way to stimulate milk supply is by having baby at the breast a lot. If baby won't feed because there's not much milk, then pumping as much as possible is the next best thing.
Other supplements you can try are fenugreek and blessed thistle - I'm sure there's a FAQ about supplements.
Good luck and {{{hugs}}}