How do you relieve stress??

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i have a real problem with stress. i worry and cause myself to lose it over little things. i don't have a short temper at all, but i have a problem with letting things roll off my back.

i have been a tense person ever since high school. mainly because i want everything perfect and planned. now i KNOW that nothing always go as planned. change is a part of life. so dont tell me that.
i stress over it anyway.

now it has dramatically change my health. i get headaches a lot. i get aches and pains. my weight has even changed. i know that there is medical proof in stress releasing a chemcial in your stomach area that cause a little weight gain. i have changed my eating habits. i haven't drank soda in 6 months and i eat sweets not very often.


is there anything that i can do to calm myself down and relax? i want to take it easy, but i am afraid of not achieving my goals.
but i want to be healthy too.