Stress in and of itself is not bad, in fact by any other name it's good for us! It's our frame of mind and how we approach things that can lead to what we call stress with the bad connotation.
Modern neurobiology/neuroscience has recently proven that our thinking is what controls our brains. (The brain has no opinion of things by itself, it operates totally upon the thoughts you send it---good or not.)
Try viewing the situations you experience in another way. Rephrase how you think. For example instead of becoming angry physically over something, tell yourself (or even if a person is involved) "That really makes me angry...BUT..." and then finish the sentence with a positive way to handle the situation. If it's something at work and you plan on leaving that job anyway, then tell yourself that soon you will change jobs and that situation/person won't be a bother any more.
Anytime you have a negative thought, recognize it and change it immediately. When we think a negative thought and we don't address it it goes into the brain and develops a physical "tree" or "branch" on a negative ---toxic--- tree which kills brain cells. These healthy or toxic trees are now visible on certain MRIs. The "thought" is no longer just an ethereal entity!
Thoughts are what control your brain, which controls the chemicals in your body. ... What you dwell upon is what you brain will create in your body. Fear of cancer will produce cancer, i.e. if that's what you keep telling yourself/your brain.
Ok.... so the old adages about attitude and approaches to life are true! Several years back they labelled it "the observer effect" where several scientists viewed the exact same event through different microscopes (one each) with individual video cameras... and each one saw and recorded what they thought they would see----even though it was different than the scientist viewing right next to them!
Think healthy thoughts. You aren't trapped. You can always change things for the better, though sometimes it takes a little longer than we might like... and sometimes you might jump ship too soon and suffer consequences but then, again, you can always change things again...
Breathe.
Get good restorative sleep. (Shut down ALL electronics for at least an hour before sleep; black out all lights in the sleeping room...)
Eat good food. If your diet is garbage, then at least add in good food until you find you don't need the garbage any more.
Work hard; play hard.
Believe.