I am sorry to hear of your loss, and wish you the best as you search for better employment now and in the future.
There are a couple of different approaches to take in your situation. The first is the ostrich approach. It involves acting as though nothing has happened, and keeping up appearances and one's lifestyle at all costs.
Though this is a common approach, I highly discourage it. It usually ends badly, with excess debt and all that that brings.
The second is the Man the Lifeboats approach. It involves reassessing the situation as it actually is and making the necessary adjustments.
Ideally you can calmly take a look at your budget, asking yourself: If I had to live on this new lower salary forever, what adjustments would have to be made? Selling a car? Eating all meals at home and brown-bagging lunch? Reducing or forgoing retirement plan contributions? Only you have the answers to this question.
Whatever they may be, you will be in a much better, which is to say sustainable, situation if you can budget in a way that doesn't rely on regaining better-paying employment in the near future. That way you will be in a better position to find a better-paying position at your leisure and not make hasty, desperate decisions, which often turn out badly.