A reason i decided to invest big now

The reason i have made such a rash decision as to invest £3,000.00 out of the blue next week is the Euro 2016 referendum where i would expect the stock markets to go very volatile apparently a good time to buy and sell, i am actually banking on the UK Markets to dip for a period, it's what i do that could make or brake me, i may even do nothing, but i figure the best time for me to make anything is next week. I know for the next week i will be very nervous in trying to decide the right choices to make, i wish i knew more about stocks and shares to make better decisions