My sincerest condolences.
Its always hard to lose those you are closest too. However, just as if you were to pass, you know you would not want others to suffer, and surely, they would not want you to be sad and in pain either.
I believe that the end, isnt really the end... that we do move on, in some other form. A brand new beginning. I highly recommend watching, "What Dreams May Come". Its mirrors the thoughts and beliefs of many, is very enlightening, and is a very moving, very powerful, and very beautiful film.
(and I usually did not care too much for Robin Williams 'over the top' antics. Though this time, he plays a very serious role, and really pulls it off, like you wouldnt believe)