How to Get ADHD Husband into Treatment?

Hi everyone.  I'm new to this forum, and this is my first post.  My husband has never been diagnosed by a doctor, but we both know that he has pretty severe ADHD.  I am finding it hard to cope right now because when I try to talk to him about therapy or medication, he has a violent negative reaction.  He absolutely refuses to pursue either option.  He says he's tried everything, that therapy's a scam, that he's seen friends take meds that messed them up, that his personality could be permanently altered by meds, that an ADHD diagnosis could make him unable to get a security clearance if he decided to take a gov't job, etc., etc...  I know he loves me, but I don't know what to do.  He's literally the smartest person I've ever met, but his disorganization/procrastination/forgetfulness has already cost him several jobs, and this latest spate of unemployment has lasted six months already.  He only recently sent out a resume and seems to be pinning all his hopes on that one job.  We are both 30 with no children, but I know the worry of having to take care of us financially is taking its toll on my health.  I also feel ignored because most of his time is spent with his computer.  We don't even sleep together because of his insomnia - I sleep alone almost every night.  I take care of all the housework, and I take care of his appointment schedule because he forgets otherwise and refuses to put alerts into his phone.  I'm at my wits' end.  He is jeopardizing both our financial future and my health (both physical and mental).  We've gone over the topic of medication and therapy several times over the 5 years that we've been together, but it always ends up in a huge fight.  I don't know what to do.