Sone died from complications of HIV however it was too late to provide help to him. The SWING Foundation in Pattaya can provide help to those from Thailand, Laos and Cambodia. PrEP and PEP can be provided free to those in need and meds can be provided via Banglamung Hospital at a one time cost of about 3000 Baht. But best to contact SWING for the details.
SWING is located on South Pattaya Road close to the Vespa Service Center. Best to go in person for free testing and help since they sometimes are busy and don't always answer the phone.
SWING also has offices in Bangkok.