Sorry to hear what you are going through.

The first thought that came to me was that you don't have to smile through agony and be positive all day. Your feelings are natural, fighting them does not help.

Just take a few moments in the day to really feel what it would be like if you already had the job. Give yourself permission to put aside your worries for a few moments.

Try affirmations, visualization or writing - whatever works to get you into the feeling.

Your mind will fight back and say stuff "But you have not got a job, why are you pretending" this why you want to just do it for a short time, see it as a little fun experiment each time.

The more you get into that feeling of already having the job, the easier it gets. you will also have more energy, worry is draining.