...I think you mean 'regenerates'. Regurgitating is throwing up food you just chewed, like what mother birds do for their young; they chew their food for them.
...Spontaneous combustion, by definition, would generate instantly in the subject, having built up energy for it - or just being flammable.
And...okay, I'm going to stop right now and ask it: what is with you and your morbid fascination with spontaneous combustion?