If you enjoy the doc, there are some guided meditations associated with it which should come up in the suggestions on YT. You mentioned 'mindfulness', what about meditation? It is considered to be the most (by a long distance) effective way to treat acute anxiety....also, if the mind is saying 'this isn't working', it is probably not the case that it isn't - we can just observe the games as they play out, no action required (including thought :).