You can go to jail but it is not so much for failing to appear in court as it is from failing to pay your support order. If you show up and you make payment and a plan to pay off the balance that is reasonable, you will likely not go to jail. Continuing to ignore the problem, as you guessed, only makes it worse. You need to face your fears and make a plan to take care of this and stick to it. Get money together, turn yourself in and have a concrete plan on how you will pay it off and maintain the current order.