I've used the following Notary many times. He's not cheap nor overly expensive. Located on the corner of Sukhumvit Soi 25 (Glass Haus):
www.SuwatLaw.com
I had treatement for varicose veins many years ago at Bangkok Nursing Home hospital Epidural and stripping the veins in one leg (the worst one). It was successful and only mild pain afterwards. The operation was carried out by a surgeon from Chula hospital moonlighting at BNH. Can't remember his name but he was very professional.