Don't check your portfolio balance daily. Depending on your balance and specific holdings, you could be seeing your portfolio value drop by $10,000, $20,000, or more from one day to the next during this period of volatility. That's enough to drive even a seasoned investor to the point of panic.It's for this reason that you should avoid checking your portfolio balance every day during rocky periods like the one we're in the midst of. Doing so could lead you to rash decisions, like selling off inv...