I'm going to ask a few more questions before responding to make sure I understand your situation.

How long have you been taking the Concerta?

Just to clarify, these are the side effects you are now having?
-Appetite loss
-Anxiety
-Puking
-Blurred vision
-Skin rash

Have you been having all of those side effects the entire time you've taken the Concerta or just at the higher doses? (I'm assuming you didn't start at 90 mg/day.)

Are you taking any other medications?

Looking forward to your answers.