there are two things that are guaranteed to calm me down if i'm highly stressed and/or having a panic attack.
the first is my partner. if he's around, i can get cuddles from him and be just fine. the second is sensory deprivation floating. the most relaxing thing i've ever experienced in life.
of course, those two things are not available to everybody and i am very fortunate to have them. so, other than those things.
cleaning will typically completely clear my mind, which is incredibly helpful if i'm having a "stuck in my own head" kind of stress
gardening helps when i am both stressed and depressed. or just sitting/walking in dirt. dirt is very good for your emotional well being
going for a jog helps me when i am angry or extremely overwhelmed
stretching, meditating, yoga, or laying in a bath help me feel good no matter what is going on in my life (but are particularly good for physical stress)
and working on my business makes me feel productive and responsible, which in turn cuts my stress down a bit
and aromatherapy, always. dem essential oils can fix anything