Hi Debbie,
I am new here myself, my Wife passed away in December 2016. This first year of Birthdays and anniversaries, is going to be very hard for us, I am dreading it, it's our wedding anniversary in August and Janices birthday in September.
I can't really advise you what to do, or how to get through it, as I am at the same stage, but , since being here, I have found help and wonderful support and believe it or not , laughter, from some stories in posts here, I have not been able to laugh since Janice went.
All I can say is celebrate your Dads birthday, make it a special day, and remember, there is always someone here for you.
My thoughts and prayers are with you