1. You need liquid money. Go to the bank and get some cash. $20 bills are preferable as they are most common. An ATM would be simple, but they usually only allow you to take out $500 per day for security reasons. So, you may want to go to the counter.
You have more assets than just what's in the bank. Jewelry, TV, Computer, etc. Pawn it. Yes, they will likely want ID, but you haven't lost your tail yet.
2. Lose your tail. Buy some airline tickets on a credit card. Drive to the airport and park in long term parking. Walk into the airport and through a crowd. However, you probably don't want to go through security. Leave the airport. I used to say, get on a train and catch as many transfers as possible. Most cities don't check your ticket at each station or when you leave the system, so you become very difficult to locate. However, cities such as Washington D.C. aren't like that, be careful. Also note that light rail surveillance systems have become much more complex in the last decade and they may have facial recognition that will ruin this plan.
I personally like the Borne Identity approach of finding a shitty old car, and giving the owner a wad of cash for it. Yeah, the car may break down, but no one knows it's yours, and it most likely won't be reported stolen. It'll be very hard to track.
3. Keep on the move, and keep a low profile. Try to travel in a direction other than the one you bought airline tickets for. You've bought yourself some time to come up with a plan from here. Weather permits, you can sleep in the car/camp. Truck stops have showers, etc. to keep you civilized. If it's cold, you may need to hide out in homeless shelters. Traveling on foot in the wilderness has advantages and disadvantages. The biggest disadvantage is you won't cover enough ground. It'll give the people after you a very small area to search. If you decide to ditch the car and travel on foot, be sure to hide the car well. Once your car is found abandoned, they will figure you are near by.