can i sue the insurance company for 5,000,000??

i was in a car accident the guy was on the wrong side of the street police were on the corner when it happen from this accident i have neck spasm and a slip disc....before the accident occurred i made a deal with a friend of mine that i would be his personal assistant for the next 10 years he was in the staten island ferry crash and was given 18 million in a settlement we had a deal that he would give me 5 million if i lived with him for the ten years and helped him in and out the bed and do most of the work around the house.. my doctor told me i would not be able to do this because of my injury...so because of that i could not do the job and he hired someone else to do the job...will i be able to sue for the 5 million and if so would 3 million be a reasonable to settle for?