TS,

Before convincing yourself that you have a medical condition,why not practice public speaking - there is no other better place that Toastmasters. These guys know how to do it, and they know how to overcome the challenges.

I suggest you find a Toastmasters club nearby your place, go for a few sessions as a guest, then see how you feel. If you're not comfortable in one club you can always go try out another club.

Yes, the whole point is to get out of your comfort zone and to get used to public speaking.
What I meant in my previuos post is that if you don't like how things are done (or timing or location) in one Toastmasters club you can always attend as a guest at another location.

Give it a try, most of the people I've met from Toastmasters are very sociable and helpful. They're also very supportive of newbies.