What finally worked to get my DH to go was his stepmom, a nurse who he greatly respects, sat him down and said "You are not a child. Your family is counting on you. Your kids need you to be healthy so that you can help to support and raise them." He finally went to get a chest X-ray and antibiotics for pneumonia. They wanted to admit him. This was a few years ago, but since then he has been better about going/taking care of himself. Maybe your DH has someone similar who can talk sense to him? Goodness knows I had been on DH for over a month by the time she finally got through to him.