Is there any part of your skin in that area that feels thin or very soft or bubbling out? I had a very small hernia by my belly button. It hurt a little when I would cough and sneeze. After a few weeks it felt better. Dr. told me not to worry about it unless it bulged out or was extremly painful.
I'm not as far as long as you are but I have had some sharp belly button pain recently too. I'm assuming it is RLP as I've had a similar feelings in other locations.
Re: Belly button pain?