For the last several months my Dad has been showing signs of pretty severe diabetes. Excessive thirst, pissing all the time, massive weight loss, excessive fatigue, etc. The stubborn old bastard refused to go to the doctor for months despite knowing that he was severely messed up. Turns out that he collapsed last weekend and didn't tell anybody, but he scared himself enough that he went to a doctor.
He was diagnosed with diabetes, but that's not what caused him to collapse. The massive weight loss was caused by muscle cannibalization since he couldn't get energy from sugar. He's messed up his heart pretty bad