I am planning to move for a longer period of time to Thailand. I already got DTV visa (fairly simple process). Now I am looking for a decent health insurance. I don't have existing preconditions, and actually what would I need is the care "in case of sth" I could buy a policy from my home country but these are more like tourist policies, which is not what I need. I need a good insurance in case of sudden sickness (like flue, etc) or in case of required hospitalization, injuries ect. Can you recommend something?

I am an in-patient in hospital with Dengue on an IV. My SETV finish on 12 (2 days). The doctor says he is happy to write whatever he needs to inform immigration, as currently I am only getting worse. He told me to find out is there a form he needs to use or anything specific he needs to write. My local immigration is Samui. I am a UK passport holder. TIA