Is it so that FM causes the body to attract other chronic illnesses or do other illnesses attract FM?

I have
epilepsy (head injury as a child)
tinitus (same head injury)
myoclonus
fibromyalgia
diabetes (insulin dependent)
peripheral neurothapy
major depressive disorder
agoraphobia
generalised anixiety disorder
panic attacks
ocd

How many others have multiple disorders or diseases? and how do you think they are related?

Rhian