I never thought I was very stressed, but looking back, I suppose I've had my share of stress.
Back in high school, I never got too stressed about my schoolwork. I graduated a year early, for which I had to keep my grades up, which was really my only source of stress in school. I never found high school too hard, though.
In high school, almost all my stress came from my relationship with my girlfriend. Not so much problems between us, but because of her abusive mother. I was always worried about her safety, sometimes even for her life. I told her a bedtime story every night--one I'd thought of during the day--so she could sleep. I think it was probably quite helpful to my writing. Her mother hated me, and we could only see each other in secret, and she would often get hurt if we were caught. That added a lot of stress even to happy occasions. To deal with the stress, we wrote letters to each other every day in class and exchanged them when we got to see each other. I already mentioned the stories I told her every night before we slept, and those helped both of us as well. Made us believe everything would be okay (which, thankfully, it eventually was).
In college, I'm lucky enough to have an apartment with her, now. Most of my stress comes from school, these days. I'm a physics and statistics major. Due to my AP credits, in my first year I was taking sophomore-level physics classes, and graduate level stats classes. My first semester was pretty easy, but my second semester I took too many credit hours and it almost killed me. I got really stressed about lots of my homework assignments and certainly every final exam. The stress probably comes mostly from needing to keep a 3.5 to keep my scholarship. Because of how I work, I rarely ever take breaks while working, so my assignments often have the effect of making me forget to eat. Late at night, I could often be found rocking back and forth on the couch, which probably has something to do with me being Asperger's. I often got freaked out about not having time to do the dishes or clean up the apartment at strange times and talk to myself while trying to do those in the middle of an assignment.
To deal with that stress? Well, when I'm stressed I usually rock back and forth and try to block other people out, but that doesn't make me less worried, just keeps me from freaking out. Another thing that helps is cigarettes. Whether you think it's unhealthy or not, a cigarette gets the dopamine flowing again and clears my mind from the fog of irrational fears, so I can focus on what I'm trying to do. My girlfriend and another friend of mine have been prescribed klonopin (clonazepam, which is similar to Xanax, but less addictive) for anxiety disorders. They've been known to drug me with it once in a while so I don't freak out, too much. Most of my stress is from fear of failure, so all this just allows me get my work done, instead of shutting down. Talking to friends also helps, although it takes a lot for me and my friends to be able to talk about our emotions, because we're all rather antisocial in some ways. I drink recreationally (and responsibly) sometimes, but I've never used alcohol as a coping mechanism, because I know that kind of thing usually ends badly.
That's about all I can think of now. If you have any questions, I can elaborate.