I was diagnosed with Rheumatoid Arthritis on my last trip.I was assuming it was gout[You know what they say about assuming.] I was prescribed all the drugs that I am now taking in Australia[Prednisolone,Arava,Methotrexate]. Seeing the Specialist wasn't expensive but the drugs were. That's where they make their money..I'm not in BKK so can't advise.I'd just bite the bullet and see a specialist.After a visit or two you can "self-medicate" if you wish????