Parenting

Why oh why does parenting have to be so hard? When you throw a special need into the mix, all hell can break loose!
Aiden was recently diagnosed with ADHD. We've tried behavior modification techniques, change in diet (completely eliminated milk and drastically reduced his intake of sugar and artificial colors), and went to parenting classes. Nothing was working and his focus at school was getting worse, so we talked to his doctor some more and decided to start medication, Ritalin. He is on a very low dose in the morning to start, with the possibility of adding an afternoon dose when he goes back to school (he's on Winter Break).
So we started the medicine a couple of days ago and we've noticed a huge difference in his focus and behavior! HOWEVER we had a VERY difficult day today. The kind of day that made me need to run away to Target by myself after Ben got home from work.
I just don't know what else to do! I feel like an absolute failure as a mom! I don't want him to feel like he has to act out to get attention, and I know he doesn't like acting that way, but know he doesn't know what else to do.
I will keep searching for ways to help him and myself with dealing with this obstacle!