Yes. In DBZ episode "Our Hero Awakes" he makes a full recovery.
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Yes, Goku in Future Trunks' timeline had died of the heart virus that ravaged him.
Well I don't really know how goku got exposed but Trunks (A boy from the future) warns goku about the virus so Trunks gives Goku medicine wich goku uses in the middle of his virus. Goku, while fighting android 19, starts enduring the symptoms of the virus wich weekens Goku and gives 19 an oppurtunity to end Goku if it wasn't for Vegeta.
at first no, but Trunks comes back in time from the future to give Goku the antidote
From Cell?
Wish on namek dragon balls