This is an example of why it is sometimes better to ask for a meeting than to dash of an email. Conversations allow you to gauge the situation better. Anyway,

This is an example of why it is sometimes better to ask for a meeting than to dash of an email. Conversations allow you to gauge the situation better. Anyway, what's done is done. Don't worry. If they really cared, then they would have responded to your email and explained the upcoming urgent project. It's even possible they were wanting you to leave. You spared them the pain of firing you to make room for a new person. Good luck with finding a job where you are better appreciated and given the extra responsibilities that will let you showcase your skills and dedication.