Dealing with the anxiety related to the volatility of your porfolio
Follow the Nassim Taleb's advice - don't listen to noise. (The price changes you see every day are just noise (just like the "news" on the TV). Don't look at prices every day. Or even every month. Look at them once per year. And your life will be better.)
I highly recommend Taleb's books. It change the way you perceive things (not only finance-related).
(I also have hard time following this advice, but I accept this noise more calmly after I read the Taleb's books. Also,"The Antidote" by Oliver Burkeman might help with your anxiety.)