I personally don't know of any in the Philippines. NDRF (dysautonomia research site) mentions Japan and Taiwan as far as Asia goes.
Because you mention episodes, I wonder if any of the doctors you saw tested you for pheochromocytoma? It's a rare tumor, usually found on an adrenal gland, that can episodically give off large amounts of catecholamine(s), which can cause high blood pressure, tachycardia, headache, sweating, etc.. Tachycardia itself can make a person short of breath.