Budgeting tips when income drops - what worked for you?

I am $750 short each month and trying to find it. I have read a lot of threads here and could not find my exact situation. The rent is fixed and the car payment is high. What helped you?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.