Gardasil and asd

My 9 year old daughter got her first shot in Dec. 2008 and her second in Feb. and the last in June. We have have been to the doctor a lot of times due to headaches with the doctor's opinion being that it's "allergies". She is now on allergy shots with still no relief from the headaches. I listened to her pediatrician and got her the shots. I feel so bad now after reading all the problems others are having with this vaccine. She also has had a change in her attitude aggression,moodiness,cries often, and she says she's depressed. If anybody has any suggestions for us please let me know. I love my little girl and know I'm worried.