Is It Normal To Have Low BP ?

hi the thing is that both me and my mother share the same thing Very low blood pressure it happenes that my normal blood pressure is 100/65 some times i walk in my job with really lower than that so they call me Zombie here they once checked it out and it was 75/55 and i didn t feel anything bad is it really normal to have such a thing???? I work at school and and the achool doctor is the one who called me Zombie, i run through my classes and what else!!!!! I eat lots of salt and chocolate!! is it enought enfo oh and i tried it with more than once and in defrence tool i forget what we should call it, i even tried the elctronical one and it gave me almost the same results, that is way i am asking. I work at school and and the school doctor is the one who called me Zombie, i run through my classes and what else!!!!! I eat lots of salt and chocolate!! is it enough enfo oh and i tried it with more than once and in many tools,, i forget what we should call it, i even tried the elctronical one and it gave me almost the same results, that is way i am asking.