I apologize for your loss.  It has to be devastating to loose a child - while he/she is in the prime of their life.  What has to be harder is that you didn't not have proper time to say good-bye to him.

I don't think that you should feel anxiety about not remembering your dreams.  It is true - dreams are a function of our subconscious - and - there are certain dreams we do not have the ability to recall.  But because your heart longs to communicate with your son - if you dreamt about him - I am sure you would recall it (as it would be the desire of your heart).

Also - I want to share something with you - and I ask - that you please refrain - if at all possible - from offense.

Your son is in eternity.  He has no ability to communicate with you.  There are people who say that they have the gift of operating as a 'medium' bridging the gap between the living and the dead - but in fact - they are not.  The spiritualist are actually communicating with spirits - in torrment - that lack rest - which disguise themselves as 'familiar' images.