I can understand, at least a little bit, what you're going through. My father unfortunately passed away from lung cancer a few years back, but he had been battling the disease for a couple years prior. A lot of people seem to try to bury their feelings during that time, and while it's important to stay positive, it really does help to talk about it.
I agree with what Roary said, talk with your closest friend(s) about it, and don't be afraid to show emotion. I made the mistake of bottling it up, and it's really affected my relationships and even my day-to-day mood for a long time. Feel free to add my skype (chase_2208) if you want to talk.