SO “needs time to think”

So my husband has been on a work trip going on 2 1/2 weeks now. He just got the bad news he has to stay longer than expected and of course neither of us is too happy about it. Long story short, we ended up getting into an argument, he hung up on me, refused to call me back and texted saying he “needs time to think”. Me being me I freaked out (horrible ptsd from a horrific breakup with abusive ex bf) and pleaded with him to just talk it out over the phone before we both went to bed but he refused. He said if I don’t leave him alone, he will divorce me. So my question is, what do I do now? Do I wait for him to reach out again? Put up with being ignored?(which I don’t find very fair in a marriage) or what? I tend to always be the one apologizing just because I don’t want to lose him. How should I react if or when he does reach out again? Or even when he gets home?