ADHD is fake?????

Hi everyone,

Firstly, my husband has been diagnosed with ADHD as a child. We have also determined that his mother has it, and possibly his father (which has passed away 20 years ago). We have seen another psychiatrist recently to confirm that my husband is still struggling with Adult ADHD.

Since I've finally recognized that ADHD is what is causing so much problems in my marriage, I've embarked on a journey learning about ADHD. I've specially ordered Melissa Orlov's book The ADHD Effect on Marriage, I reside in South Africa. Everything I've read in this book has been SPOT ON. To me, it's been the absolute best investment I could make in my marriage. 

Now, I am very concerned. I've read articles of studies that have been conducted in children that use Ritalin. It has been confirmed that Ritalin stunts development growth by 3 years. I read another recent article that gives the impression ADHD does not really exist, and is a fake and made up theory. Here is the link to this article:

We are looking to find some medication for my husband to help cope with some ADHD symptoms. He is also struggling terribly to sleep. However, most popular ADHD medication ALL has insomnia listed as a side effect (Ritalin, Concerta, Strattera, etc.) which is really not going to help at all. He needs his sleep, he works very long hours. Someone also told me that he should try take melatonin, but I've read very concerning views regarding this. 

I'm confused because I have now all this conflicting information, and suddenly ADHD may not even be a reality. Please may I ask what are your thoughts and could you possibly give me sound advice? 

Thank you.