Extreme loss of salt due to excessive sweating

Patient: I work in extremely hot conditions, I am also an excessive sweater and lose salt quickly which causes heat related problems regularly. I was told by an E.R. doctor to consume alot of salt. I also have high blood pressure at times and I am on medication that increases sweating. My concern is that having to consume so much salt just to make it through my work day, Is this dangerous for me? I have a history of heat stress, and it is a constant battle for me

Doctor: