How to stop worrying about Money

One of the best ways to stop worrying about money is first understanding exactly what it is and for this, I would advise anyone to actually watch Positive Money videos on Youtube on how money is created and what it actually is.
To learn even more about it you can read their book :

Modernising Money: Why Our Monetary System is Broken and How it Can be Fixed

From there, the question you have to ask yourself is what are the strategies I can possibly implement to ensure that money issues do not impact on mental health. If you feel that you are struggling financially and that the issue of money is taking a toll on you, please refer to a GP or a counsellor to help you, talk to your friend and family, keep a diary. Ultimately, you have to find a way to make the issue of money not causing further issues in your being.

I wish you good luck with this. It is only the beginning of the journey to realise that you and everything around you have intrinsic value and it is down to you to recognise it.