@asterix2k10, it seems to me it is not the caffeine in tea that keeps you alert. That is because the green teas you have previously ordered and some of the Phoenixes should have similar, if not more, caffeine than Lapsang Souchong Pristine. I cannot say for sure, but I suspect it is what I call in TCM term “dampness” toxins that is giving you difficulties after black teas. Black teas are generally more dampness conducive, second only to new shengcha puers and the very green versions of Tieguanyins and other similar style Minnan/Taiwan oolongs.
If you allow me to be straightforward, and I have only good intention, normally when the physique of a person is already in the “dampness-ridden” condition that such a tea would trigger the effect. Dampness causes irritability.
A capable TCM herbalist maybe able to prescribe according to his diagnosis a formula of a few common herbs. Coupled with perhaps a change in diet and life-style, the balance of your energies could very well be restored and there will be no more avoidance of any teas.
Meanwhile for tea, I recommend the use of bouquet style Phoenixes, lighter or medium baked Wuyi or classic style Phoenixes (in this same order of ranking). Use a bit more leaves so you can use shorter infusions for good taste, and can repeat more times. The effect, in terms of health, is more effective in driving out dampness toxins.
