You're young. Stick it in a money market account or something safe for a few months until you can get some real financial advice.
Personally, if I had $5 million I would probably leave it in money market and safe CDs until this period of global deflation and low interest rates is past us. I would wait until the inevitable inflation that is coming in a few years, and when interest rates are over 10% (hopefully), put a couple million in fixed annuities that will pay out monthly for the rest of my life, put 1-2 million in safer investments, and invest the other million in risky stocks with a high potential payout.
That way, I have guaranteed income for the rest of my life from the annuities, enough to live off of, and can hopefully see some better returns from the rest of the money. A good financial advisor can give you a better strategy.