I try to do breathing exercises/guided meditation before bed and after I take my nighttime pills, including a benzo for anxiety. It will only help to a point with extreme stress, but it's one way of taking care of yourself. Bubble baths or an extra shower can be soothing, a favorite scented candle or lotion, pamper yourself.

Also, one thing I got into recently that helps with stress is yoga. It really helps with controlling breathing, and it is one of the only things I found that releases tension. If you aren't into yoga, then maybe some light stretches, or on youtube you can find progressive muscle relaxation, which combines meditation and releases tension. Every now and then, I'll splurge and get a massage. For me, it helps tremendously (especially with the physical symptoms caused by anxiety), but of course it's better to do other things to cope since it's expensive and can only be an occasional thing at best.