Hard to say. A new stem and handlebars might make your bike perfect but maybe not. I'd personally try to find a suitable comfort bike that feels right then see if it's feasible to get the Hard Rock adjusted to feel the same. I suspect that you might just be better off taking the financial hit, selling or trading in your bike, and getting a whole new (perfect) bike though.

If you do decide to sell it you may as well ride it for a while longer and see if it starts to feel better.