It's hard to work in marketing and/or automotive in Detroit without having been through a layoff or two. They can be scary. I'm a veteran of two, and to be honest, I'm among those waiting to see if the ax is going to fall on my own neck. But here is what you do. First, don't panic. Second, look over your paperwork carefully and make sure you understand everything in there. Third, file for unemployment as soon as possible.
After you've done those things, give your resume and LinkedIn a fresh look. Give thought to the best keywords that not only reflect what employers are looking for, but what you want to do. Remember -- this isn't about your value. This was a business decision that very likely does not reflect your own performance at all. This can be an opportunity, if you can look at it that way. I've managed to wind up better off after two layoffs than I was in those positions.
Take advantage of LinkedIn, research and contact recruiters on there for companies and career fields you're interested in -- getting LinkedIn premium could be worth it. And don't be afraid to reach out and talk to people you know about your situation. Former co-workers, vendors you've worked with, and any connections you've made in either your field or a field you'd like to transition into. Set up some coffee dates where you can have a casual conversation about word on the street, etc. -- not begging for work.
Whatever you do, just don't give up.