Need some reassurance

[eternalsunsh1ne]

A week ago I got up too quick and fainted for the first time in my life and since then I've been feeling faint and I'm worried about it happening again.

I've agreed to work in friend of a friends pub tomorrow because they need extra help and I'm so scared I'm going to pass out. I know that standing for a long time causes me to feel light headed also and I'm going to be on my feet for hours tomorrow. I'm already anxious over things like not knowing table numbers and serving the wrong food, doing stuff wrong and embarrassing myself.

I don't want to give a bad impression by sitting down all the time when I feel it coming on but I don't want to pass out either. It will just send me into a panic attack.

I guess I just need some reassurance but what can I do to deal with being light headed and being on my feet all day?