Well, that was easier than i thought. I now have clonidine.
I was dreading yet another fight with a medico and their catty authority. But my GP said OK almost immediately.
So, I am off propranolol, hopefully off zopiclone, taking modafinil+clonidine.
Observations, from one day's use (bearing in mind i usually have some placebo effect, lasting ~2 weeks): no more butterflies in the stomach, my mind is off permanent overdrive (big relief), i don't feel unnaturally calm (as i did on propranolol) but i do feel calm. On the negative, i have less drive/spark/holy-fire. Hopefully i can find a level of dose where i do have some spark and still be functional.
Singing/ I have been trying to develop my voice. I figure this is useful above and beyond a small chance of becoming some kind of religious idol -- useful for public speaking, or indeed private speaking. Major finding so far: posture is important, in particular the angle between the body and neck should be straight up and down. I find that i can hit notes a lot better if i do this, and that it sounds better. It is very easy to fall back into a slouch when not paying attention! Angle between neck and head, however, does not seem to be all that important.
Also important is the thing about opening up the back of the mouth and throat, as if there's a plum in there.
With these things, my voice gets a "metallic" edge, and a *lot* louder. I guess this is what is meant by "projecting your voice". The vocal cavity resonates a lot more, and thus does not need extra effort to be louder.
Another interesting thing is that by practicing *loudly*, i find my voice gains a nice edge to it even when soft. A sort of "i could be loud if i wanted to" quality.