Our son is 25 and requesting to talk with a doctor about symptoms of brain cold and hot with brain freezes. He is a facility operator in the fracking industry and works 12 hours per day minimum and on call the rest of the time. His area of expertise is mechanics and builds motors - understands compression ratios,etc; however he is experiencing brain freezes on the job and is not able to get the words out and complete thoughts. He is very concerned there is a problem with his brain. He is single and very laid back personality so it is extremely unusual for him to ever want to see a doctor. Does this sounds serious or minor?