I have a son with ADHD who is struggling in school

My 11 year old son was dx with ADHD when he was about 7-8 years old. When have been through two medications. One that made him so dopey that he was in a twilight stage and the other made no difference what so ever. We have been trying to control it with diet. I give him a caffeinated drink in the morning i.e coffee with a flavored cream (no sugar) and he has a diet pepsi with his lunch. So far this has work the best and I have heard that caffeine acts as a stimulant to his brain but does not make him hyper. I really do not want to do the meds, but we need something that is going to make him understand that he needs to participate in school. He has been ok for a while but then all of a sudden there were several issues in school today that raises our concern again. Help.

I don't have much experience of children with ADHD or otherwise, but I do have experience of children with low capacity for concentration.

My eldest son is slightly hyper and finds it very hard to concentrate and work at something practical and has an easier time being creative-

Right now I am very tired, I have also been dealing with troublesome children, my two boys are not bad at the moment but our daughter is very ill, she had a temp 0f 39.9 degrees Celcius today, that was bad and tough, but she is a fighter.

When it comes to children that can't concentrate there is usually a catalyst that allows them to focus, not necessarily in the way you wish, but to the best of their ability. You see, the thing about children with difficulties for concentration is that there is something missing to permit that catalyst kick in. you have to find that, and for each child it is different, but one common thing is understanding and compassion.