Unsurprisingly lots of people have been in similar situations, so there is a Wiki article on one of the Internet's best personal finance and investing websites: "Managing a windfall"
https://www.bogleheads.org/wiki/Managing_a_windfall
"Do nothing rash. Set aside one year's living expenses[note 2] and place the rest of the windfall into low risk investments (FDIC insured accounts, money market funds, treasury bills) for one year. As it may take as long as five years for the windfall recipient to adjust to a new life, this pause provides a chance for emotions to cool, helps avoid impulsive behavior, and, if warranted, allows the recipient time to put together a team of professional advisers."
"Do nothing rash. Set aside one year's living expenses[note 2] and place the rest of the windfall into low risk investments (FDIC insured accounts, money market funds, treasury bills) for one year. As it may take as long as five years for the windfall recipient to adjust to a new life, this pause provides a chance for emotions to cool, helps avoid impulsive behavior, and, if warranted, allows the recipient time to put together a team of professional advisers."