Hi, have a look at the link below, it will take you to a past thread started by one of my co-community leaders here on the forum. It discusses claiming for social security and disability, it may help you:
http://www.medhelp.org/posts/Dysautonomia-Autonomic-Dysfunction/Social-Security--Medicare--Medicaid--etc/show/1091637
Personally, I believe that the safety of yourself and others around you at work should be paramount. Maybe, if it is not safe for you to continue in your role, your employer could provide another position for you (depending on your contract, I think this is legally the correct protocol for employers to follow).
I would discuss this with your doctors and your employer and hopefully you can make a joint decision that you are happy with x
Keep us updated x