Orthostatic hypotension and tachycardia

So a few months ago it got really bad for me. I went to the hospital but they told me there was nothing they could do and sent me home.

I have chronic migraines as well as silent migraines and hemiplegic migraines. So I take promethaxine for anti nausea for them, which was okd by my ob to take. So I have been taking benedryl and promethazine daily in the am, because the worst of it was when I ate after waking up.

Now I’m getting it all day long.

I have been drinking Powerade, water, eating salt. Nothing is working.

It’s gotten to the point that I cannot stand for longer than 3 min without everything going black.

Any advice?