No need to freak out; Relax!
Do NOT donate - That is being irresponsible
Do NOT hire someone - It's not their money; you were at the right place at the right time - not them - you have the responsibility to invest right.
Please do NOT retire - you are at your prime age of contributing back to the society - surely, take more vacations, and spend time with family - may be work only 3 days a week.
Do NOT spend on a fancy house or a car - Not worth it.
If it's of your interest, become a venture capital - You should be looking at 10:1 success ratio - so be ready to lose money on most of the investments - but eventually, you'll create so much value, that it'll be worth it.
Take at least a quarter or two of time to decide the budget - you'll learn a lot. And I believe you have the liberty to do it. ;)
Set aside 10% or whatever you are comfortable to lose for risky investments(bitcoin and sorts) and returns from that for squandering - Don't go over budget there.
Park money in an insured, interest-bearing spot (1% yearly is going to give you 80k just for parking - consider money market accounts - Caveat: FDIC Insurance covers only till 250k per account per person - figure out the details)
Most importantly, what you are essentially getting is time - Try to find a cause worth spending your time.
One last piece of advice - Don't get attached - Know that money is the means, not the ends.