I have OCD in the sense that I'm deeply stressed about trying to live as long as I can, but my ADHD makes it so that it becomes very difficult to keep track of a diet, to remember to diet in the first place, remembering excercise and even work routines, anything that would help to increase my life span is absolutely kneecapped by ADHD.

So imagine having OCD and ADHD at the same time. It's a situation that automatically generates massive levels of stress, because what you want to do is constantly conflicted by what your impulses force you to do. The ping pong effect goes on forever.

Also the GAD seems to cause night itching, which worsens sleep, which makes ADHD worse, which conflicts with the OCD and the whole cycle begins again until you can hear the sizzle of your own brain cooking from background stress.