Sounds like he's got a lot of problems and very needy. And your reactions is to think he is manipulating you for hours to get your attention. You know this is the beginning of co dependency..right?
There is nothing wrong with sharing your day,but why would he rattle on about it when he could see a Dr...Why listen to that for hours if you can't do or read an xray of his foot. Simple.. tell him to make a Drs appointment and don't make it for him. If he won't go,then walk away and find something interesting to do. At least that's one problem solved. If this was a child,it would be different. .But certainly it is your choice