I am so sorry about your father. I grew up without mine, too, and the effects that has on a daughter (or son, I'm sure) are tremendous. Know that it is not your fault, and his action only speck for his character or problems, whatever they are. A father's absence can often, if not always, be felt by the child as an abandonment and produces guilt and feelings of inferiority. I'm speaking from my experience here. I have a long story about this but will spare you! Message me if you want to hear it.
Negative feelings can, I think, bring about various beings, thoughtforms, etc. They are most likely of your own creation and mean you no harm. Once you start feeling better, they will leave. The physical actions in the blog post will help.
As far as you attitude on the inside, that's another creature! The path I choose for purification was Buddhism and a little hermetics. The Buddhist path is the most clear cut and can be used by anyone whether or not they are Buddhist. It basically teaches you to get rid of negative states of mind. It's the same with the hermetics...it teaches you to look at yourself honestly...I think most all of the spiritual paths have some sort of purification process.
I encourage you to face this issue with your dad. Mine caused me to marry the wrong guy and stay in a bad relationship for many years as well as other self-destructive behaviours. . . but mine has been a long, drawn out kinda thing, with a huge step-family involved for years and other issues that I'm just now finding out about.
Feel better soon and message me anytime:)