Wibble indeed :o)
Potted history: Cable jointer on BT, suffered back injury at work that led to spinal surgery and medical retirement from BT. Went back to college to start learning stuff for a new career. Got 2/3 of way through a degree in physiology and pharmacology but the constant pain from my back (and I really do mean 24/7 pain) got me down and started suffering from depression and couldn't do the work.
Doctors note needed for uni said "To whom it may concern. This is to confirm that Mr. xxx is under my care at the moment suffering from a mental illness......"
So I'm a loony, I've got the paperwork to prove it, and my missus never lets me live it down :o)