HELP!! I had just spent the last 5 days in the hospital with an unknown medical condition, during…

HELP!! I had just spent the last 5 days in the hospital with an unknown medical condition, during the first 4 days I was not allowed food or fluids. Barely received any through iv...my build up is basically no longer. And I need the quickest way to start back up my baby needs his mommy milk and I don't know what to do!