I'd be delighted to have a fast-progressing degenerative disease. I think it would be ideal to be aware of passing from living to dying, rather than have it be sudden, with little to no awareness. It also gives you time to set everything in order, say goodbye to people and so on. I've done some online research on whether it's possible to deliberately contract a terminal disease, but I haven't had any luck so far.
If anyone has any tips (I'm not holding my breath) (and no I don't mean smoking or becoming obese, etc ; ) I'd love to hear!
Also, I wouldn't even mind so much if it were something slow and degrading like ALS. I would just stop eating and drinking (VSED). No one would section me, and people would understand I think, and perhaps provide palliative care.