I Am Frequently Experiencing Short Term Memory Loss(I Think That

I am frequently experiencing short term memory loss(I think that is the term for it). I will be listening to my coach tell me something and when I turn around to do it literally the next moment I will have completely forgot what they said. This is very embarrassing and scary and I don't want to ask them again because they literally just told me. I don't know how to fix this. I remember something similar to this happening when I was little because I would go up to my mom to defend myself in a fight against a sibling and not remember what either of us said or did next. I do not think I have had any head trauma when I was younger, but may have had a concussion from an accident at work last year. I don't know how to fix this issue. Can you help?