Sounds like you need to evaluate your time horizon and willingness to accept risk.
Vanguard has a simple questionnaire to help you suss out some basics. Once you've completed this check, then analyze your investments to see if your current mix is best for your goal.
My rule of thumb is, as you get closer to needing your money, the more risk averse your investing should become. I have a good 25 years before I retire so I don't mind putting more into common stocks and riding through the current roller-coaster of a market. If I were looking to retire in 5 years though, I'd definitely be looking at principal preservation and yield maximization.
I'm not a financial adviser or anything like that. This is not a professional opinion, so don't treat it as such. The good news is there's tons of investment info available on the internet, so you should be able to find corroborating information based on your goals. The bad news is there's tons of investment info available on the internet so it's going to take awhile to cut through the chaff.