Neurally Mediated Syncope help!

Hi there. I have been diagnosed with Neurally Mediated Syncope for roughly less than a year. However I have been expieriencing symptoms for about 6 years. My symptoms include, passing out, lightheadedness, dizzyness, sensitivity to temperature change (mostly to hot), hotflashes, cold flashes, foggyness etc.
When I was diagnosed, the spells were pretty rare. I passed out and experienced symptoms once every few months, so he didn't put me on any medications and just suggested that I were to go on a high salt diet and lots of liquids.
Latley, for the past few weeks, I've been very foggy, light headed and i have to work very hard to breathe. I also have asthma, but my puffers seem to have no affect on my breathing. When I'm experiencing these symptoms, usually they go away after lying down for a while. But they keep returning once I get up. I know I need to go see the doctor. But I was wondering if anyone could recomend some medications I could suggest? Or if anyone who are also experiencing any of my symptoms if you had any advice I would greatly appreciate it.