fixed mental image of father

For as long as I remember I have had a fixed mental image of my father in my mind, which is more prominent at certain times than others. I have been with my husband for 27 years and when I consciously try to conjure up his image in my mind I see my dad instead. It used to upset me but that made it worse so I have learned to accept it but I have just been through a period of anxiety and panic attacks when I wake up in the morning, I think triggered by me and my husband going through a bad patch and we have been talking about divorce. And now this image is stronger than ever and I would not like to think that I die without ever understanding the cause of it or how to dissolve it. I want to be able to conjure up the image of whoever I want! So I am posting here to ask if anyone has experienced anything similar or if anyone has any ideas what to do about it?