Hey Kiwong, it's great you were able to talk to people etc!
The way I do it, is schedule a relaxing activity/time after it later on that day and next day (or a few)... If you read about the concept of 'overwhelm'/'underwhelm' it can be helpful.. So you need some time to recuperate, and then you can talk to people again..
It also helps me to write things down, like a 'report' on the meeting/s and any issues or next actions, things to research or do etc. Hope this works for you too!
(also might wanna check things like nutrition, weather, etc. different things recommended for knee health than anti-anxiety etc!)
as for thoughts of uncertain future - have you tried doing some CBT on them (like Dr David Burns recommends in The Feeling Good Handbook? He was worried about the future of his son too, and wrote down the negative thoughts and 'worst case scenarios' than looked for validity and thought what he could do in worst case too.. for example, you could still walk/jog/hike, write the book/s... )