dear doctor , My mother is 47 years old. She is having a unknown problem since 2000. she has high blood pressure, when she got the problem she does not talk to anybody , she just sleep a lot , feel very week, does eat, and it last 1-3 week then she becomes normal toatlly healthy women. we took her to so many doctors but no one couldnt find what is wrong with her. Some neurologist says when she get sick she does not have blood in her body , some says she had problem with her brain, they tested everything but could not find any wrong. my question why she feel so week and where does her blood goes when she get sick , What specilist should we consult to solve her problem. i will be very appreciate if u gives us some advice regarding this. thanks