I'm so sorry you are feeling poorly. I think the worst thing about this is that you are undiagnosed ... this makes everything much more confusing and scary. However, the docs don't feel there's anything serious do they? There are so many conditions that could be causing your problem ... food allergies, inflammatory illnesses etc, and it is a process of elimination. I am sure you'll get a diagnosis in due course. Until then, try not to worry too much (easier said than done, I know). I do sympathise with you ... I have had years and years of patchy health and no one knows what the reason is. They suspect something autoimmune but the actual cause is extremely good at concealing itself!