Quoting Evelynns Mama!:" I haven't been feeling well at all today... nausea, vomitting, diarrhea, cramping, etc.. As the nights ... [snip!] ... at 3-5 weeks old every once in a while when my milk supply was smurfed up and didn't supply enough for her. What should I do? "
Sounds like you have the FLU. Not much can be done in the ER. Do you happen to have any meds at home? Maybe some immodium or tylenol for the cramping? A warm bath will also do you good.
Honestly, I would pump before I went if you do go and get as much as you can. Then mix it with some formula if you aren't back in time. I wouldn't take her period.