Mind power to overcome fear - can one be immune to fear?

Hi, I was cured from TMS for 3 years, but fear of TMS started all over again... I think fear is what causes TMS.

Why are people in certain periods of their lives more susceptible to fear? Is fear cumulative? I notice an increase in unconscious fear, when climate change, at night, or in certain odd situations, or ambients... Sometimes I feel I'm less immune to fear, why is that?

My subconscious is usually full with fear, and right now, fulled with fear of TMS, that arises when I'm sleeping. Can I release fear doing mindpower/meditation? Is this the best way?

Did anyone tried doing this mind training?

https://www.learnmindpower.com/article/understanding-fear/

Thanks