I'd pay some seriously good money for some information about how to efficiently meditate with ADD. From my experience, it is a poor tool to improve one's condition, and ADD makes it nigh impossible to efficiently meditate anyway. I have done some googling on that topic and only find lame "meditation for wellbeing" BS all around, but nothing clearly targeted for ADD.
Lookup a 10 day vipassana retreat /with a good teacher/ (important! Bad vipassana can cause psychosis esp. if teacher is rigid. And uve a traumatic past)
In the beginning, you will fight your ego, certain traumas will surface, you learn to accept alot about urself too. The less that disturbs the ego, the calmer it is.
Even to this my meditation is disturbed, but im a much calmer person.
Mind you its complex too, could be a food habits/mild allergy contributing to existing factors. Did you try a water fast with some power coffee?
