Your more general enquiry seems to be around how to be more grateful and less neurotic and I think that mindfulness meditation should help improve those areas.

Being more mindful helps you become more self-aware. Thus, when you feel frustrated you are more likely to objectively notice the emotion which somehow makes it unravel.

As for the gratitude I don't know how mindfulness meditation helps with that but experientially (n=1) I can tell you that it does.