I was denied health insurance due to my knee injuries. Need advice.

So since I've had two knee injuries while in college, I was under LSU's health plan which covered me. Well, now that I graduated and I am looking for health coverage... I was denied by the first company I assumed would take me--Blue Cross tBlue Shield. I had my left knee reconstructed in 2007 and the my right knee done last summer, 2010. I was released in February 2011 and I have been strong and healthy since then. I can even get my doctors to vouch for me that I am healthy. And no I am not working full-time right now so getting health insurance with a company is out of the question. I run my own business and do part-time work for Red Bull.
What options do I have? And has anyone else ran into this problem before?