You should re-evaluate your relationship as soon as possible. In securing employment, you have increased your independence both on a personal and financial level. This means that your husband has less control over what you do and who you meet.
It may also be possible that he has genuine concerns about your wellbeing or for the welfare of your family. Without knowing your background, it is difficult to provide a definitive reply. Nonetheless, giving you the silent treatment for one month, especially for a positive achievement, is an extreme measure and should not be taken lightly.