aero bars work very well for some people, I suggest you borrow a set and try them on a long ride first. The worst thing about them is how much more pressure they put on your umm, well on places there shouldn't be pressure. I used them when I was racing, I could get some speed improvement for a couple miles at a time. My problem is that I get sort of a "third lung" when I am in top shape, where I can breath very deeply. When I go aero it scrunches me up so much that I can't get my third lung. It does help some people, especially taller people it seems. Give it a try, it is definately an advantage and will take pressure off your hands, just make sure it's not at the expense of your other important parts...
One more thing- do some research before you get a cortisone shot. I did get one, a couple times, and it made me feel 10 years younger. For a few weeks only though. Just ask some questions first, maybe some in here can help more with that one. I will not do it again.