It sounds like you have pain from chronic sensory nerve involvement in scar tissue- called neuroma. These problems can (as you know) be very difficult to manage, and I doubt that your planned abdominoplasty would improve this pain.
In fact, it is important to realize that your tummy tuck may even make this pain worse in the short term, by creating more tension on your abdominal wall.
In cases like yours, my usual approach is to first sort out the existing pain by sending you for an evaluation with a pain specialist. They can often find the nerves involved in the causation of the pain and if so, numb them long term, making you pain free.
Once comfortable, you can then proceed with your planned tummy tuck without this concern.
I hope that helps you- good luck.