Insurance co. of person who hit my car denied liability because of a med. emergency. From whom do I seek damages?

A man driving a company car blacked out and came across median and hit me. The company insurance payed for my totaled car then I heard nothing. I was ready to settle so I called to verify address and thats when I first learned they had denied fault over a year ago!!! They sent a letter to the parent company of my insurance company over a year ago, but never sent anything to me. I only learned this by calling them myself. Who do I send my demand letter to? am I out of luck on my lost wages, pain and suffering, future med etc. I have full coverage with my insurance co as did he with his co.