How do I deal with Chronic back pain while on holidays?

We are thinking of going on holidays this coming summer but I have severe chronic back pain. In 1997 I had two back surgery (broken bones so I have a bone fusion at L-4 and L-5). I will be travelling from Ottawa Canada to Prince Edward Island, Canada. Now it has been discovered that I have yet another hernia ted disc at L-2, L-3. I do take painkillers, heating pad, hot and cold packs. Anti inflammatory drugs but still I have permanent chronic pain. It seems that this has taken over my entire life. I have not gone on holidays since the surgery 11 years ago. Can anyone tell me how to travel in reasonable comfort by car on such a long trip. Many thanks in advance for all your replies. By the way I am 58 years old.