I think it is too soon and raw for you to make any decisions about it yet.
I agree that your husband might not be able to give you the exact emotional support you need in this. Not because he doesn't care, but just because of his position in your V.
I don't understand why he would refuse to read your note though.
But once you feel a little better there is no reason he could not perhaps help you fill your time up, go on days out etc. To take your mind off things? Then your answer will come to you gradually on its own.
Some things definitely seem unresolved with A.