Pete Alexander breaks down how stress shows up in your body: trouble concentrating, sudden mood swings, anxiety about what's coming, and reaching for alcohol or pills more often. He calls it listening to your body.
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First and foremost, what I would do is highly suggest listening to your body. Basically, we stress ourselves out both mentally and physically, and you just have to be aware. So let's say mentally, maybe if you're experiencing problem with concentration when you used to be able to focus, or you're getting mood swings and you're going from happy to sad or angry at a moment's notice, or you're getting some anxiety about something that may or may not happen about the future, or let's say you're finding meaning that you're drinking more or you're using your prescription drugs more, all of those things are indicators that you're mentally stressed.