According to HIPAA -- Health Insurance Portability and Accountability Act your hubby's condition may not be considered Pre-Existing as long as he has not had a breach in coverage of 63 days or more. The new COBRA legislation that went into effect on March 1st of this year will certainly make COBRA insurance a lot more affordable, with the government covering 65% of the COBRA payment for up to 9 months. Hopefully you and your husband can take advantage of this new legislation in an effort to insure there is no breach in health care coverage.
Shortness of breath and chest pain are certainly symptoms that may be heart related. He'll never know til he goes in for a check up. I'd advise him to do so, the alternative to getting it checked out may not be so pretty.