Hey kitkat and Glass,
Don't you just love the medical profession, instead of making a direct answer of 'we don't know' they give it a label of "idiopathic in nature". For many, many years I was told it was all idiopathic or I was imagining it, I was a hypochondriac. Then 20 years on and I'm driving down the road and the lights went out, couldn't see. Had a scan and the doctors come out all surprised, like "ohh look what we found" There had been signs, there had been symptoms. They called them all idiopathic. It is BS, don't accept idiopathic as an answer.
Post op I saw a naturopath who told me that he may have been able to help, so I implore you to investigate. If you think things are not right, then ask the questions, follow through with all the advice. You are the one dealing with it, no one else. Do not be allowing them to minimise you. Investigate every option open to you because, you never know, someone might have an alternative option.

Merl1n