To both people who left a reply, thank you :)
Since putting this post up I've had no more dreams that have left me feeling lost and distressed upon waking.
My dad still visits me in my dreams but now the dreams are a whole lot nicer, and even though I do say goodbye at the end, I'm not distressed about it.
This is exactly what I was seeking, I love seeing him in my dreams, being able to hug him again, but when I return to the waking world it feels nice.
Maybe all I needed was to share my experience, and in doing so has released what was making me so distressed.
I hope everyone finds their way, whatever that way is.
Love and Light always.
Mon.