This gets complicated, so having experienced lawyers advising you is your best course. You are entitled to a recovery for your additional pain and suffering due to the accident and for any temporary or permanent worsening of your underlying preexisting condition. When you have a previous condition, it is important to get legal advice on what to do about your medical care as soon as possible. It is very important in this situation to create an accurate medical record of the new condition and new symptoms as soon as possible after the accident.