Help please: Dealing with insurance company, How can I make sure that I am not being ripped off?

I live in Canada. I had a car accident two days ago. The other party was in fault and my car is a write off. Now I have to deal with the other party’s insurance company to get compensated. I have heard that the insurance company pays me the book value of the car. This is not fair at all. My car had a lot of upgrades and I had no intention to sell it anytime soon. How can I get a fair amount from them for my car? Moreover, I have some injuries too (back, neck and wrist pains). Is there any way to get a fair compensation for this problem as well?