Original power ballad?
But why not either of:
a) Boston, "Can'tcha Say (You Believe in Me) / Still in Love" from 1986's "Third Stage"
https://www.youtube.com/watch?v=myu8Y764WwE
b) Faster Pussycat, "House Of Pain" from 1989's "Wake Me When It’s Over" (maybe too far post-1986?)
https://www.youtube.com/watch?v=Q8z4SEbsqbw
See this list, too:
"111 Top Power Ballads: The definitive list that nobody asked for …"
https://docs.google.com/document/d/186y2HrXNyc3Frfhv-JeHRvwv9qHs_bvtaqmUggUgU3M
Cheers!