My parents died of old age months apart from each other. I am an only child. How do I recover from the loneliness?

I lived next door to my parents for most of my adult life. My Mom cooked dinner for the three of us every day. We would go fishing together and do numerous things all of my life as a family. My Dad and I were business partners. He never wanted to be retired so I always allowed him to work at my office or hang out every day. I have spent so many years with my parents always at my side and seeing them every day of my life. I can not adjust now that they are both gone.