I find this fear of hoods fascinating - interesting how, under the influence of different drugs/medication, it is advised not to put anything over the head... I wonder if there could be a psychological connection between a documented medical risk and a plain fear.

As for advice, I'm far from the best person to be on the giving end rather than the receiving end, however I'd agree with what Denuseri said - start small with a blindfold. Maybe even one that could can see a little through so your vision isn't entirely blacked out. Also, in response to losing the control of your breathing - perhaps have a fan running in the room. More of a psychological aid rather than a physical one - even if you ignore it, your brain should be subconsciously aware that there IS fresh air flowing around you. It might work, it might not - never know until you try. I've found in life that it's the little things that count.

Best of luck!