Snakes represent many different things, but usually the 'life-process'. If we think of a person's life from conception to death, we see a flowing, moving event. The snake depicts the force of energy behind that movement and purpose that leads us to both, growth and death... along with the passionate emotions and urges, that drive us so powerfully.
So, in some dreams, the snake represents our sexuality, and vitality, throughout our life. In other dreams, the snake can represent creative, or poisonous, energy of our thoughts and emotions.
In the destructive aspect, the snake represents the temptations, poisonous thoughts, and negative emotions that can destroy us.
In the positive aspect, the snake represents a sharp awareness of the world around you, as well as a renewal of life and opportunities.
That you could identify the snake, and that it is poisonous (viper) suggests that there is something your husband is doing that you see as destructive or 'poisonous' to your relationship.
Dark blue - depression, negative thoughts, and aggression.
Light blue - the sense of intuition, having a wide awareness of life, religious feelings, and the 'coolness' of nature.
Soft gentle blue - a typically feminine color, representing the nurturing and emotional expression.
Blue may sometimes symbolize the universal or collective unconscious (as distinct from the individual unconscious). Perhaps the dream is asking you to base your life on intuitions that come from a deep source within your psyche.
His dying could suggest you feel something about him (where you are concerned) has died, or that's there something about him you would like to see him rid of...a bad habit, or attitude.
Your screaming and crying is an expression of your fears and anxieties.
His coming back to life suggests you feel there is hope for a renewal between you and your husband.
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Have you recently quarrelled and spiteful, or poisonous, things were said?
Do you feel your husband is being tempted by someone, or something ...and could cause damage to your relationship?
Does your husband have a habit or attitude you'd like to see changed or gone altogether?

Hope this helps, good luck!