Does anyone have experience with Clonidine for ADHD?

My 12 year old daughter was recently diagnosed with ADHD in addition to anxiety. We tried Concerta, which did nothing - then Adderall...which was great for school but made her a mess at home with constant screaming and meltdowns. We've taken her off of these and they are now trying Clonidine along with anxiety medication. We are on day 4 and she is so sleepy and dizzy - the first two days she fell asleep in school and I had to pick her up. Yesterday she fell asleep on the floor while a friend was over! Has anyone had success with this medication and if so, how long did it take before these side effects go away? I'm supposed to give it to her morning and afternoon, but I haven't even given her the 2nd doses yet because just one dose turns her into a zombie.