Don't start flight training until you make sure you can obtain a medical. The ADHD thing sucks. Ritalin is a no fly med because it's a psychotropic medication. I had two students that had ADHD and taken ritalin in the past but quit. One was honest on his app and it took over a year and additional testing to be cleared for a medical. The other wasn't lied and was caught. He was denied a medical.