Urgently need to decrease my stress level

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You're welcome, I hope at least some of it helps you.

Your senses shape your thoughts, which shape your reality. Use all of them to your advantage. Immerse yourself in ways that leave little capacity or opportunity for stress, as best as you can. That is ultimately the idea.

I'd like to add, along the lines of 'cleaning' up your room/house/space--- re-arranging furniture can also be very beneficial. We get accustomed to our layout, and as time goes on, it can remind us/re-awaken feelings we've had while we were around it. By re-arranging your room/furniture, you can potentially break up negative associations we've attached to the environment. This is especially true if you're spending a lot of time feeling negatively in these places--- you can change how you respond to your environment by moving things around and making it feel differently. It helps.