I also have lots of stress and I don't really know how to prevent what life brings but when I feel stressed out, I stream some favorite music or TV episodes on my computer and it helps me calm down.
Listening to a fan or an air conditioner or heater also helps me relax. I don't know if it would bother your sensory but I like it.
Hope this helps. 
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Diagnosed with Aspergers, ADHD, Bipolar Type II, OCD, and generalized anxiety.