How much more stressful is college on a non-traditional student, and what are some good ways to deal with college stress at 30?

What can I do to get some support after an act of violence happened on-campus at my school (or off-campus, but to a student here)? I feel a little lost right now...

I've never been very good at managing my time, getting homework done, or staying organized. Yet, I learned to work around this and get things done rather successfully. However, recently, I haven't been able to do ANYTHING. I can't get school work done. It's starting to impact my grades. I think this might be a result of a stressful junior year combined with a stressful summer job. I worked 50 hours a week at an understaffed Boys and Girls Club. There might be something about taking care of children — many with serious family/home issues — that really drained me. I only had about a week of summer vacation where I wasn't either working or at home with pneumonia. I went from a rough summer into a difficult senior year. Now, I feel like I need a break to collect myself, but I know I won't get that break until I graduate. What can I do? I don't think I need new organizational strategies, I've picked those up over the years, but then again if I knew what I needed I guess I wouldn't be asking!

Does exercise really reduce stress? I recently took a new job that is very high stress, and I need a release. My friend says I should take up mountain biking, that it will reduce my stress (and keep me from gaining weight at this desk job). Thanks for the great site.

Recently I've been thinking a lot about ways to relieve my stress and other mental problems such as OCD and ADD and I have been hearing that meditation, yoga, tai-chi, etc. can possilby help with these problems that I have been suffering with all my life, but I am very confused as to which one would be the best for me.

Also, if I find out which one would work the best for me, how would I go about finding someone that could teach me these things? Or is a book a good way to go? If a book is a good way to go would you suggest one of those "The Complete Idiot's Guide to..." books?

I recently went to my doctor because I've been unable to lose weight. I've been on a successful diet, accompanied with a reasonable exercise plan, but I've seen no real results. A series of tests were run — I've got optimum blood pressure, low cholesterol, and I am not diabetic. But, when my cortisol levels were checked — they were very high. The doctor suspected there was a possibility that I might have Cushings' Syndrome — but another test was run and that came up negative.

I was doing research on the internet, and I found that there was a link between excessive cortisol and depression. I was diagnosed with clinical depression when I was 12 (I am now 21). And I am currently untreated. What is the link between cortisol levels and depression? Are excessive cortisol levels a physical manifestation of depression? Or does an excess of cortisol for some other reason cause depression? Does an excessive amount of cortisol cause weight gain, or in my case prohibit weight loss? And if there is a connection — will treatment for my clinical depression (in the form of prescription pills) help me?

I've been unable to find answers anywhere, or at least a good source to tell me to stop worrying — any help would be appreciated.