Insurance is a pooled risk, the more people in the pool, the lower the cost. For a single person, it's huge. And you have a pre-existing condition, which is also going to jack the cost to high heaven. Recent changes in the law have made them stop from just excluding you outright, but they don't prohibit them from raising the rates.
One of the best ways for an unemployed person (or one not covered at work) to get cheap insurance is to start their own company and do it through that.