OMG I almost wrote this same thread this morning. I had a severe case of Gastro but only for 12hours. OMG it was aweful. My supply was fine during the Gastro but 12hours later I literally dried up. J actually took a bottle (she has refused to take a bottle up until then so she must have been hungry) I'd say I was so dehydrated thats why my supply vanished. Anyway with 2 bottles (only 60mls each) and now I'm recovered my supply is back to normal. Obviously for me it was just short term until I rehydrated.
Hope you recover quick and your supply is back to normal quickly. For me I think the bottle or 2 helped us both.