Question: regaining lost milk supply?

My milk is going, if not already gone! I've been
drinking Mother's Milk tea and nursing or pumping as
much of the time as possible lately to try and
stimulate more of it, but it's been slowly dwindling
anyway and I don't know if it can be saved. I suspect
dehydration and semistarvation as the culprits; I've
been bad about taking care of myself recently; the
baby takes so much of my attention I haven't been
getting in my own meals. I've tried to get apple juice
down at least, but it's hard, and stress tends to
cause nausea for me, which doesn't make it any easier.

Anyway, the question is, if it's honestly gone -- and
I think it is; my breasts feel different today, more
'normal' than since before I conceived, and I'm not
leaking anymore, nor can I get anything out with the
pump -- is it gone for good (or at least till I have
another baby) or is it possible for desperate measures
to restart it again?