my six year, started taking Vyvanse 20 mg yesterday , she expericened yesterday a headache that lasted all day, stomach was hurting, and blurred vision. Today she still has a headache, stomach hurts, and some itching. is this medicine to strong for her? is she having an allergic reaction? I called the dr. office but the dr. is out until tomorrow. I don t think i should give her any medicine tomorrow becasue of the side effects.