My Dr. did not believe me when I told her I thought my cancer was back.
In my experience, it's very easy to fall through the cracks, so to speak. If you feel like you're unwell and left your doctor's office feeling dissatisfied and still uneasy, see another doctor. And be unapologetic about it. Insist on testing.
If it would not have been for my wifes "feelings" they would never have caught her lung cancer as early as they did. ( The Dr. asked if she had every had a chest x-ray, and lets just get one for a base line.) And then when it spread to her head, they did not believe her, but because she persisted they gave her a CT of the brain.
Go with your gut instinct. Your body will tell you when something is wrong if you just learn to listen to your own.
Some Drs. forget, they may have the degree...but we are the best at knowing our own body! It is not always as written in a book!