How much should I ask for in a demand letter to the insurance company for personal injury, and least acceptable payment?

I was involved in an accident where a driver that was going in the opposite direction turned left in front of me at the last moment and we had a moderate crash where he hit the left front side of my car. Damages to vehicle were about 2,000.00. I had been injured with multiple injuries, non-life threatening, but painful. Impingement of bursa or tendons in left shoulder, cervical strain and strained/sprained sternum. I went to Dr. for 7 months where treatment was anti-inflammatory drugs and home exercise. ER visit was $12,000.00 including a $7,000.00 body scan/CT of some sort with contrast. Other Dr. bills were about $2,000.00. I went back to work driving a Taxi two days after the accident. It was painful to drive, but I had no choice to keep a roof over my head, although I cut a lot of my 12hr. days short due to pain over six months. I claim $750.00 missed work due only to half days off due to Dr. appointments. Insurance company has already accepted full responsibility for their driver’s actions. I still have pain in my shoulder, and have been released by my Dr. on an as needed basis. How much do you think the least I should ask for in a demand letter, and how much is the least I should accept from said Insurance Co.?