Had a scare

Megan
So I decided today to return some bottles and cans today and I brought down a pretty heavy bag from the attic. After going back and forth up and down the stairs and carrying and getting there I started feeling dizzy and nauseous. I went outside and sat down, twice then tried to do and quick shopping and almost passed out. (Note: didn't eat since 1030am this was almost 5pm) I had to go sit in the pharmacy. I finally got home and had some cramping. I immediately got on the couch with my feet up. No bleeding or anything but just scared. Doctors appointment on Tuesday so hopefully everything will be fine. 
Thanks for any advice!💕