Do you know of any national employers who offer health insurance for pre-existing conditions?

How long do you have to be on the job to get it? The condition is multiple sclerosis.
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Assuming you live and work in the U.S.A., federal HIPAA law may provide you with some protections, depending upon your circumstances. Since there isn't enough information in your question for me to advise you, I suggest you go here: http://www.cms.hhs.gov/HealthInsReformfo… and read through the information, particularly the booklet with the link at the bottom, titled "Protecting Your Health Insurance Coverage." I hope this helps.
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