wtf do i do

so basically my bf’s mom bought expensive meat to cook for me for the first time this saturday. I just got my period so saturday is gonna be SUPER HEAVY flow. my period is super insane and I have bad anemia.... and i pass out even with food in front of me (my body is super weird).... so now I have to go to his house with a super heavy flow..... I have no choice but to go. it’s also bad weather and I have to drive in it. ugh I have such anxiety someone help.