Quirrel

Does anyone know of a pharmacy in BKK that sells Ritalin over the counter? There is one in Pattaya, but that is too far to go. As a child I was diagnosed with ADD, ritalin kept it under control, 20s and 30s were okay, but into my 40s and it is back interfering with life again, before I go down the visit the doctor again route, I want to try a week self medicating to see if it works the same, if it doesn't then doctors it is.