Well, you don't sound like a nut case to us! Like many folks on this website, we end up having many tests before finally receiving a diagnosis.
Have you heard an update from your doctor(s)?
Do you know your Vitamin D level? If yours is low, I've read that supplementing with Vitamin D can lower your cholesterol.
Have you heard anything new from your doctors wrt the HIPA and other testing they may have done? Given that they've proceeded with an invasive biopsy, they must have some ideas. I've had many biopsies myself and there is a wealth of data.
Please let us know how your are doing, more info will be helpful in understanding where you stand.