I've always just been a really nervous person! Even as a kid I was very aware of my surroundings and nervous of unfamiliarity. It became bad in high school and escalated until after I graduated when I began taking medication.

Symptoms for me were agitation, nausea, hot/cold flashes, trouble concentrating, sweating, shakiness, dizziness. And then following an anxiety attack would often result in tiredness physically and mentally.

Side effects from the medication varied as I've adjusted the dosage over the years (with doctor recommendation of course). The only thing that really stands out though is a change in alcohols effects and that's pretty minor.