If you weren't economically dependent on that person (which seems to be most likely in your case), it is only "emotional pain" which you need to deal with. Emotional pain occurs quite often in Joe Public's life, whether it is because you lose your job, your girlfriend leaves you, or a "loved one" dies. The best way of dealing with it is rationalizing it:
Was that person really important for you?
If so, how can you replace it?
etc...
Was that person important to you, then it's like in a strategy game; when you lose an base/ army without any gain, you must think of a way how to replace it, f.e. by utilizing your remaining bases/ building more cost effective units, etc...
This may sound harsh, but thats the way life works. Many humans have died before your uncle and many more will die after him, not to talk of the higher organisms or life in general that has passed away.
Besides, your uncle would have died eventually, so you wouldn't have been spared of the "pain" anyway.
Think about it. And live the NOW, or how it is said in chess; play the position - how it came to be is insignificant. It could also had happened that you never had an uncle at all.
Alternatively you can get yourself lobotomized, or become a sociopath, that would also serve the purpose ;)