None of the stuff you mention at the end has any impact on ADHD at all. ADHD is a medical issue related to brain function and neurotransmitter production and reuptake, and there is no correlation between eliminated food, additives or adding anything (unless the data came from the manufacturer of the item!) so let all that junk go and save your time and money. The only thing that could assist him on your list is exercise, but I am curious about your remark that he is a tactile learner. Does he have senosry issues? If that is the case, then get him to an Occupational therapist privately right away and find out what he needs. If you find that he has needs in this area, this could explain everything, and you should proceed with plan B.
Plan A is: Email your teacher. Write a summery of your converstaion with her about her wanting him to be evaluated for ADHD and on Medication. Ask her to reply in writing within 10 school days if your summary is in correct, and if you do not have a writen response within that time, you will assume that your summary is accurate. Take that email, and send it to the special education department and demand a full evaluation, including a medical evaluation because the school suggested that your son had a problem, and it is now their responsiblity to evaluate him. If they are not going to evaluate him, then you insist that they put the pressure to provided evaluations and medications to rest and to determine the reason for your son's behavioral issues at school, becuase he does not have them at home. I would suggest that you ask them for a Functional Behavioral Assessment and a behavior plan. At some point, you are going to need to protect him from his own behavior and spell out what can be done, and what cannot be done when he misbehaves at school. There is a great deal for you to gain from a behavior plan that includes only positive interventions and supports for your child.
If you find he has sensory needs, then on to plan B: start private therapy, take the private therapists evaluation report to school, and ask for an evaluation. Don't worry about what they decide to call him, children are served based on need, not diagnosis. This would be the only way for him to get OT at school, and for him to have is sensory needs recognized, and get accomodations for his tactile learning style. OT is a related service to special education, children who are not admitted to special education cannot get OT at school. If he has this set of needs, they will soon be expressed in a huge difference between his verbal ablities, and his ablity to produce work on that level, which could be his issue in a nut shell.
If any of this sounds likely to you, get him an evaluation by a Developmental Pediatrician. You need to know if your son may really have issues. That they show up only at school says to me that they are driven by one of two things, and both can be measured so that you do not have to guess. Either, he has relative weaknesses, like a dip in his aptetude in one area that cause him to be resistant to learning and likely to act out...it is easier to be in trouble than it is to say that you don't get it when you know that you are smart enough to get it, which could be driven by the "tactile" learning style. Or, he has issues with social processing and sequencing that have only come to bear in this envionment. In any case, if the nubers are there, you want to know...you need to know, or you need to have the numbers to tell the teacher to buzz off...
Finally, a teacher is way out of line by suggesting medication at all is inapproriate. Doctors suggest medication for fully diagnosed medical issues. ADHD happens to be one of those issues for which medication is appropriate for some patients, and is very effective. Teachers do not diagnose any medical issue from asthma to ADHD. She should be exposed to her higher ups, because this kind of suggestion puts parents off and may delay a child getting approriate treament because the suggestion is so out of line if it comes from an educator.
That being said, as an advocate, one of the first things I tell clinets who are pissed off (and they are all pissed off, or they do not call me) is that even though this teacher has made you really angry, you should not discount everything she says. Use her information (and her blunder, quite honestly) to get your son exactly what he needs to be a success.
M.
Eeek. Just because the counselor and the teacher told you that medication is "your choice" (duh, all medical issues are your domain!) that does not absolve them of the major procedureal boo-boo they committed, nor does it stop you from driving a truck through it and using it to your advantage. You do have the upper hand now, you can put them on the spot, then get them to take responsiblity for making his environment one that he can be a success in!