I have money in some stocks and not gonna lie, it is taking a lot of willpower not to keep checking the numbers daily. This is scary and reminds me of the crash in stocks last 2007/2008. I lost a significant amount of my savings then as well and it still makes me worried when I actively decided to try investing in the stock market just a few years back when I got married.
A lot of people have money invested in the market and I imagine it's hard for them, too. This article may help: http://business.inquirer.net/252982/bearish-market-stay-invested-manage-risk