boyfriend of 4 years moving away

How do I deal with this? I don't know if i can do it. I feel like our relationship is already on thin ice.
He is epileptic and just had a seizure recently so they took his license for 6 months. This is a fact of life that we have delt with before and is not new. What is new is thhat he will be like 55 miles away from me...
Is there any advice?