Not sure if this is more appropriate here or in the "Drug" area, but since it is an ADD drug specific inquiry, I chose here!

How do I know if I am on the right dose of my ADD medications, and if I am on the right medication for it at all for that matter? I started on 30mg of Vyvanse, went to 60mg, then my doctor took me off completely due to my complaining about headaches. The problem I thought was the new depression medication that he had switched at the same time as putting me on the Vyvanse. The positive results from the ADD meds was immediate, but since the depression meds took longer to kick in, it was my opinion that it was the depression meds or their interaction with the ADD meds that caused the headaches. The headaches continued even off the Vyvanse, so I am now back on Vyvanse but at the low 30mg dose and I am not sure it is enough. How can I really tell what is too low or too high of a dose? Thanks.