I'm so sorry. I watched my husband's uncle die of cancer at 49 in three months. It had a big part of the anxiety I experience today. My advice is to deal and work through this as best as you can, seek professional help if necessary. For anxiety stricken person events like these can really throw a wrench in things. This was my experience anyways. My thoughts are with you in this time. You will get through this when you actively take steps to get over it. Sorry for sounding so preachy but this same event did a real number on me for many years, but everyone is different. What kind of cancer did he have?