Does ADD medicine make you feel this way?

[Ruby]

I take two types. in the morning, i think it's concerta, and it's really bothering me. i never take it on the weekend, but i did today to study for finals, and it's even worse than i thought: At school, it kicks in around 2nd period. I can't sit still, and i always want the teacher to stop talking and to do more work, or focus on another thing. I'm never hungry during the day, which sucks. I only take a few bites out of whatever i'm eating, or i have to drink something because i really won't want food. I do need the medicine though. I went off of it for a while, and my grades dropped! I took concerta today, and instead of focusing on my homework, i searched the web frequently for different things to entertain me because i needed to do lots of things at a time. Is this normal? My afternoon medicine helps though