I have formally diagnosed Fibro, HOWEVER, I'm 5'9" 75kg (gained a little since digestive system went absolute apeshit last year and lost nearly 10kg in a month while already borderline underweight. Kinda grossed out by my soft stomach, but fingers crossed I get on to medication soon that will allow me to exercise proper again) and have also formal diagnosis of severe chronic fatigue, POTS, Inappropriate Sinus Tachycardia (heart rate is always sitting around 110bpm resting instead of normal 60-70bpm) and working towards formal disagnosis of Vascular Elhers-Danlos and Ankylosing Spondylitis. In truth Fibro is a cover all for, you're suffering pain and issues affecting quality of life that has yet to be formally diagnosed. So fatties saying they have it just translates to "I'm a giant fat ass and all by issues are my own fault cause I can't stop cramming sugar and fat down my gullet."