This is why we need to see health insurance reform of some kind. Most insurance companies will not offer a policy if you have a pre-existing health issue. Some will accept certain illnesses, but they usually will put a 12 month acceptance rider, so you will be paying for a full year before you can access coverage. Large group policies work like this, but individials are out of luck for the most part. You are out of luck with current system if you are not associated with a group and even if you are, the costs are usually very high.
If you don't have any coverage at all, this may help, there is a free discount prescription card you can print instantly and save 75% or more at 58000 major pharmacies, they also offer similar discounts on lab work, MRI's and similar special services, so no sense paying full price. They stated a health care program will be available soon, so it may be worth getting a free card to see how much you can save while you search for health insurance.
I found card and printed it off at www.RecessionProof-Business.com