Your best bet would be to contact a personal injury lawyer in NC who can investigate your claim.
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I suggest that you find both a workers compensation attorney and a medical malpractice attorney in your area to investigate your claims.
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It is in your best interest to contact an experienced workers' compensation attorney in your area. This sounds like a very complicated case. I would look into all of the medications he has taken to see if any of them may be linked to heart problems. It also sounds like you may need to contact an employment attorney about the issues you are experiencing at work.
I am not licensed to practice in WV but I would suggest that you find a qualified compensation attorney right away.
I suggest that you contact an experienced CA workers compensation attorney right away for a free consultation.