Tumbling, I've been through what you're going through. You'll be okay and then a sense of intense sadness will hit you. But you must've had a thought that triggered that sadness.
Here is something to try: 1. When you have the thought (the first one) ask yourself, do I want to feel sad? Answering yes is okay, bc sometimes we need to be sad and cry and feel like we don't have to be tough. So go ahead and keep thinking, and cry or do whatever you need to do to release the feeling. If you don't want to be sad, change the thought immediately to something impersonal or to someone else's problems. I've found that reaching out to help others will help you feel better.
2. Get audiobooks for your ride home. I love Wayne Dyer. Get the books at the library.
My H did the same---no answer to emails. Be patient. If he doesn't answer, make the decision yourself and inform him of what you are doing.
In regard to texts, I would avoid long streams of messages. Texting is a fertile ground for communication mishaps. Let him call you or email you if he needs to reach you to talk about something. If he's just checking in, be nice and say you're doing well. Ask how he is and try not to be the last one to write.