I am so sorry to hear about your dad, Candlelight. I lost my mom 10 years ago and I can tell you the pain gets less but it never goes away.
The best advice I can give you is if you need to cry, please cry. Let it all out. It's no good keeping it inside. Feel what you need to feel.
And watch for a sign from your dad. He will let you know that he has made it to Heaven and he is alright.