Hi Gill and welcome,
It may help you to have a look at the diagnostic criteria and alternative criteria at the top of the "not yet diagnosed" section.
Your symptoms could be indicative of some sort of auto-immune disease but as they're all quite complex it's difficult to say which one.
Hopefully you will soon have the results of that biopsy and will be able to begin treatment to relieve your symptoms a little.
bye for now,
Katharine