
This dream is really very simple. Don't worry, you are not a murdering, phsychotic feind!! (I can see the panic in your post!)
It really depends on your sons age, and your significant others role in your life, as well as outside support.
I would say that wither you are a single mother, overwhelmed and overburdened, and harboring thoughts that terrify you of wanting to do harm to your child subconsciousely because you are overwhelmed, which you must understand is absolutely not possible given the fact that the dream concerns you so much you are seeking out to the world for an explanation oif this dream.
Water is a mutable form, therefore it mutes reality, clouds it, or thins it out, dilutes reality.
You are overburdened and overworked, and over mothering. If your son is young, get him involved with other activities, other people and positive activities that will streangthen him as an adult.
The real crux of this dream is motherly guilt, something that we women punish ourselves with far more than the paternalistic society we are forced to live in does.
The guilt that you are feeling as "Drowning in water over your head", is clearly feeling overwhelmed by your situation.
The fact that in your dream you "See him drowning, yet do nothing", shows a paralysis, a fear, a helplessness that you are currently feeling. THis can stem from a child simply growing up, and a mothers natural protective feelings towards that child to do only good, and to protect from harm. SOmetimes as mothers we have no choice but to let our children go, and experience life.
When that happens, others will come into their lives as influences, sometimes good and sometimes bad.
There is a very happy ending to your dream, which you did not recognise as positive, but it was quite clear to me. Your son constantly being rescued by others. It shows a prophetic situation in which you can rest easy, that through your childs life, he will always have assistance, when you yourself cannot help him.
Relax, all is fine, your feelings are natural and normal, and if you wish you may email me.
goodbye and good luck.