Emotions are not bad or destructive things in themselves, for most people ( I am not speaking of more serious psychiatric disorders here, such as bi polar or schizophrenia, chronic depression or other mental disturbances).
Emotions, like physical pain, are what we have to alert us to things that are wrong in our lives, not physically, but psychologically, spiritually ....
Numbing them therefore is not necesarily a good idea, particularly if one is not addressing the underlying causes. If your hand is in a burning flame, would you ask for something to stop the pain or first take your damn hand out if it?
Sometimes numbing emotional pain just means a person can avoid dealing with what is the underlying problem. Is that really a good thing? I wouldn't say so, myself.
That being said, for some people emotional turmoil can be unpleasant and cause tremendous upheaval. It might make working on problems slow, painful or difficult. But learning to walk after a terrible accident might also be difficult, and there comes a point where basically, one just has to get on with it.
If this sounds a bit harsh I don't mean it to be, but I do think anything legal or illegal that you take to numb yourself will just get in the way of healing, and had the added risk of adding addiction in to the mix.