Hey I agree with Amazonmom, I'd get that lawyer and don't fret too much.

I know you can make the limited amount. However I also know that if you show them your working a total of "9 months" and not consecutively and if your close to working a total of 9 months then they will do a review to see if your still able to be off of Medicare. However they give you an amount of months depending on your situation, I'm reading this out of the "Medicare Handbook they send you each year" all of this info will be in there. Anyway, the point to Disablitiy is that you cannot work enough to pay your way however just say someone lost disability there is an amount of time they have to wait and cut benefits.
Oh there is/was depending on what state your in that Medicare tried to get going and I happened to live in a state that was annoying people to sign up and learn, well they got me so this program is called "Ticket to Work" which gives YOU an additional amount of time and if it shows you can work then Medicare pays for your expenses and pays what you don't make plus Medicaid in each state will often pick you up. But you have to Report EVERYTHING you make, sell etc... if you don't it will be hard to prove yourself.
Like Amazonmom said don't worry so much about it. It's actually very normal.
Hope this helps some and read your Medicare manual for 2012. I'm sure they would send you another one.
Take care and Crew