I can't cope with the idea of losing him like I lost my dad and going through the pain of that again. I can't sleep, I can't eat, I'm calling him several times a day asking if he's ok while he's in work. I know this isn't normal but I can't help it. I'm terrified there could be something wrong. the "what ifs" are destroying me. 
Hi RoxyRoo35
Welcome to our community, I hope you find it both informative and supportive.
Starting with your dad, while there is no right of wrong way to grieve sometimes it can be helpful to talk to someone outside your family and if you felt it might help lots of people feel that they got support via either cruse or the loss foundation.
For your husband, I would perhaps park google for the moment, people do often share the worst of the worst though it can be helpful if you stick to sites like Macmillan or cancer research uk.
Something that helped me was when I came to realise that with driving to work everyday I was at risk from a car accident as much as anything else. I did a living with less stress course and that helped me think of what we had on a day to day basis rather than thinking of a future I could not really control.
Do let us know how the tests go and whatever we will stand together. You might like to post in our Family and friends forum too.
<<hugs>>
Steve
