Hi, I have a very big problem which really scares and I don't know what to do about this. Few days ago I went to the emergency room because I've been feeling light headed and dehydrated. I've had dehydration problem since childhood and I have thyroid problem which is the cause of my dehydration. No matter how much water I drink it's not good enough. The main problem of mine now is this light headed feeling I get and sometimes I get the feeling of faint. When I was at the emergency room they gave me IV fluids which I felt much better but I still have the same issue and they even did blood test and told me my oxygen content is low. Which is why I'm feeling like this. They didn't give me solution for this and I don't know which doctor would know more about this. I want to know which doctor I can see for this and meanwhile feeling like this is there anything I can take or do? Please let me know about this soon.