If you are not communicating well, it is important to have someone with you who is able to express your issues. I suggest you have that person, your wife would be best, practice by telling somebody about your struggles. If she can express your issues to a family member or friend first, she will do better in the pressure of the doctors office. She can also mention the changes she sees. There will be things she see that you are not as aware of.

And, Do not try to minimize or mitigate your struggles. "This does not happen all the time but ....." is a good way to tell the doctor to disregard this issue. Tell the doctor about your symptoms and let the doctor ask how often it happens.