I teach private and semi-private meditation classes from beginner to advanced but I charge for them. The best free centre seems to be Phuket Meditation in Chalong.
I teach meditation which at its most basic level is a breathing exercise. If you like you can come for a free session and I'll teach you to breathe which should give you better oxygenation and maybe help you get rid of the "stress" or whatever is causing the problem. I'm in Chalong so PM me if you want to give it a try.