I think I have anxiety

I believe that I have anxiety recently I’ve been feeling kind of lightheaded I thought that maybe that was because I wasn’t eating like I should have but today in the car while I was driving I was getting frustrated it was no reason for me to get frustrated but I was getting frustrated. I had to stop and massage my head to calm myself down. Also I was getting irritated on the phone with my school I wanted to scream and cry but I had to talk to myself in my head to calm myself down I’m having trouble focusing in class I do have attention deficit disorder so I thought maybe it could be that and I’ve also been getting headaches. I do have pills to help me control my attention deficit but I haven’t been taking them recently. I don’t think I’ve taken them since last year.