Help please

My coworkers have booked for us all to go play volleyball for an hour so I don’t have any way out of it. It’s really not the best idea for me to be doing exercise like that especially considering I get so out of breath so quickly. I also keep feeling like I’m about to faint a lot. Does anyone know any foods that are the best for giving energy and not make me feel so bad? I know that the answer should be “just eat normally” and Im not asking people to help me starve but any advice would be sooo appreciated!