How do you become aware, alert and conscious?

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Lately I just been having hard time recalling information, thinking clearly and deeply, tend to be forgetting stuff and hard to remember stuff. It's like my mind is hijacked by my health problems that I've become so silent. I'm always in my head just overthinking and doubts and worries, I feel like by night I feel so exhausted mentally when I didn't even do anything physically. But I'm very worried whenever I go outside and constantly don't feel the sense of urgency and awareness like checking my phone, wallet and keys. And tired of living in the worry phase that I want to snap out of it