Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
If he did pronounce the divorce in a sober state of mind, then it is counted as divorce. If, however, he did not have the intention to do so, and pronounced the words in a fit of anger, with no prior intention, then it is not deemed as divorce.
In the latter case, the marriage is intact. In the former case, you need to redo the nikah if the waiting period is over. The waiting period is three menstrual cycles or three months.
Having said this, I would advise both of you to take an anger management course right away if you are serious in continuing your marriage relationship. Otherwise, you may end up in the same mess again.
As an imam serving in North America for over four decades, I would urge you to do so immediately. Also, you need to study a good book on marriage. I would recommend for you to study, Blissful Marriage: A Practical Islamic Guide by Ekram Beshir and Mohamed Beshir.
Almighty Allah knows best.
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