I suffered from them for about three straight years. I would have them 24/7, even while I was sleeping. It was an absolute hell that I would wish on no one... but there IS one silver lining to having that particular problem: they can't really hurt you. When I came to that realization and stopped fighting them, and instead decided to live with them and let the panic and anxiety happen, they slowly started to recede until finally, they were gone altogether. I would say, okay... my chest may feel like it's going to cave in, my ribs may feel as if they are gonna break, my breath can be seemingly gone and my heart can flip and flop all it wants to... but I'm GOING to live my life today. And I would. I would go to the store, drive, shower... do all of those things while having 10-out-of-10 panic attacks. And by doing that, I managed to take the power away from them completely. Because remember, the fear of having a panic attack is usually the reason why you have one. It's about feeling powerless and out of control. So if you stop fearing them, they will eventually go away. 

Poor Robin Williams was very sick.  It was hard for anyone to believe how advanced his suspected lewy bodies dementia was.

He was suffering a lot.  Willie Nelson also has lewy bodies dementia, but isn’t reported to have reached as advanced a stage with the condition yet, but I worry for him sometimes as he approaches his 89th birthday.

I have schizoaffective disorder, which puts me on the spectrum for schizophrenia and bipolar disorder.  There’s a few people like Amanda Bynes that are well known with a similar experience.  I occasionally have some pain issues and regular movement difficulties as well.  Still getting stuff diagnosed and treated.  Takes a few years.

Not sure if I can talk about mental health in a way that is particularly personable and helpful, but I do wish that you all get all the support you need.