Pete,
I have a very good friend that had a 5-way bypass a couple of years ago. He is currently flying with a Class 3 medical. It took awhile to get it back but he was persistent. The process took him about a year. It would not have been as long if he had sought expert advice BEFORE applying for a special issuance. Even his AME did not get a report from his cardiologist with the proper “wording” so he was denied. He did not give up! There are many pilots out there with bypass surgery flying with special issuances. Find a cardiologist who is also an AME. Get all the required tests and have the paperwork reviewed carefully. Don’t let bypass surgery stop you from flying!