I have about 1 month left on my OA multi-entry retirement VISA extension. I've been here 3 years. I want to switch to an O retirement VISA to avoid the insurance requirement. If I leave the country, without obtaining a re-entry permit, is my VISA automatically canceled when I leave? If I then return to Thailand, after a few days holiday, will I be stamped in as VISA exempt for 30 days so that I can then begin the process of applying for the O retirement VISA within country? I am an American citizen. Are there any other options? Any "gotchas" I need to worry about? Thanks.