Ann2011,
I am so sorry for your loss. I lost my father in 2006. He'd been in a nursing home for 4 years and was slowly fading away while in there, so I understand the conflicting feelings. I still haven't cried for my dad. That doesn't mean I don't feel sad that he's gone or that I don't think about him or that I didn't love him. We all show our grief differently.
If you do have a breakdown, just let it come. I think fighting it makes it worse. You lost your father. Everyone that loves you will understand. If they don't, they are not worth worrying about.
Big hugs to you. If you need to talk to someone, please feel free to IM me!!
Lisa
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Man is fond of counting his troubles, but he does not count his joys. If he counted them up as he ought to, he would see that every lot has enough happiness provided for it. ~Fyodor Dostoevsky