How can I become more optimistic?

It seems like me and several friends have been going through a bit of disappointment/boredom with life after graduation. I work long hours and am too tired to socialize like I did when I was in school. I was just wondering if there's such a phenomenon of post-college depression?

Are there any techniques for controlling crying? I doubt that my problem requires clinical attention; however, it frequently manifests itself as a serious handicap. During conflicts (particularly with professional superiors or with significant others), I find myself unable to defend my position, which only makes the problem worse. Sympathy only tends to aggravate the crying and it is impossible to stop once it starts. I am a twenty-four-year-old graduate student, and I don't seem to be growing out of it. Any suggestions would be greatly appreciated.

I'm desperate (a permanent state, I suppose, not only for me, but also for most of my fellow human beings). I've forgotten the reason why I'm on this Planet. My life seems so senseless, eating, sleeping, going to work, hobbies, of course, while all around me, the world is tumbling down. How do I put some meaning in my life?

Last year I was Teetering on the Brink and this year I've fallen off of it. The teetering individual who was worried about how much she thought about food and her weight has turned into a very scared person who has fallen off the brink, with little on her mind but what she eats, when she eats it, and how she looks. I haven't had my period for almost a year and exercise compulsively until I can't anymore, when my legs simply hurt so bad and my knees won't hold me up. Worse, I seem to be losing bladder control — several times when I've been very tired, I've wet the bed at night or been unable to wait until I got to a bathroom. I can't live like this anymore and every morning I promise myself I'm going to change but then night rolls around and I've not changed a thing. Please tell me something that will help — I never knew desperation's face was this thin.

I have a very strong aversion to certain food textures such as potato (mashed, chipped, roasted, etc.), that causes me to gag violently. I am 22 years old and have a BMI of 16 which I blame in part to my very unbalanced diet. I am constantly lethargic but am eating three good portion meals a day. I was wondering if there was a way to get over this sensitivity as I am eating cereal without milk every morning, plain pasta for lunch and a pizza for dinner every day, I am looking to be a lot healthier with my life.

I am a 22-year-old male grad student, now starting my second semester at in graduate school. I have been doing very well academically, but my studies and my work-study job leave me absolutely no time for a social life! I have not been on a date since I got here; though I meet a lot of interesting people, and am in the habit of collecting their phone numbers. However, I can never seem to find any time to spend with them. Sometimes this really depresses me. I have noticed that I have lately been smoking much more heavily than I used to.