Terrific, glad to hear you are always happy Bex. These are just some factors to look at for those that suffer from depression or similar. I would still encourage even happy folk to look at these factors though, as you age health becomes ever more important.
You'd need to search Pearo as I don't have this on hand but the info is certainly out there. On the first one if you suffer significant stress you can feel physically ill; researchers were surprised to discover recently it works the other way too. Much still to learn about this connection.