... WHY. Any advice? Suggestions?
We men are a stubborn breed. He has to be convinced to go, not told he should go. There is a huge difference.
Well, pride. Men don't like being told what to do. Also, I've found that many men don't like to go to the doctor. It's seen as admitting weakness. It means they weren't able to "tough it out". Obviously this is silly, as not going to the doctor when needed often leads to more problems.
I can't say SeventyOne and Poppyseed78 are wrong. I just don't know. Or they may be partially right. There may be more than one ingredient in the pie, more than one reason or motivation behind not going to the doctor for a time. But I'm more with
@WolfGate, above--for all I know at the moment.
In other words, try this: Your husband has a negative or suspicious view of doctors. Your question has to do with understanding his won't-go-to-a-doctor "why," so his reasons for being suspicious of doctors does not matter, but to give you an idea, he may have accumulated stories of doctors harming people, of practicing in an unethical or arrogant manner, of being trained and paid by Big Pharma, of being ineffective or not knowing what to do, or making the wrong diagnosis. He may have had genuinely bad or less than complimentary experiences with doctors. Or feel they are way too expensive, what with insurance costs and all. The cost-to-benefit analysis is dubious.
Maybe for him some of that is an exaggeration, but catch the point: When you say, "Go to the doctor," he may get angry inside even though he knows you mean well. Of course he knows doctors also help some people at least some of the time, but a suspicious or negative attitude toward doctors or toward the medical establishment (and I have my stories and have read stories for years) might make going to the doctor for a health problem a kind of lose-lose decision. Take an either-or choice between losing $4500 or losing your front teeth. What do you do with a lose-lose choice? Postpone the decision as long as possible.
So why did your husband decide to go to the doctor, eventually? Because by then the choice of which loss was greater became clear enough (to all appearance at the time), with a little nudge from a peer (in addition to your own previously). Sort of like what SeventyOne wrote: "He has to be convinced to go." And even so, the doctor had nothing better to offer than a note to your husband's employer or boss to allow your husband's own body time to heal itself--maybe just like your husband hoped it would before going to the doctor. Now here's a bill for $300. So what was the benefit of going to the doctor? He may be weighing that in his mind even if he is grateful for the R&R.
Add to all the above (if the theory has any basis in fact, which it may or may not) money worries--as not unlikely. He's thinking he's behind in the budget for a new furnace or next car or whatever. And he's the guy that's responsible for those things. And he's thinking he wants to pull his weight on the job--maybe a fairness thing, maybe a pride thing, maybe a worry thing, maybe a customer/client needs thing or some combination of these. Or job security worries and clouds on the business horizon. Maybe your husband was thinking a medical bill for an operation or cast and x-rays would have been a possibility (on the other side of the theory "it'll heal by itself if I can endure for now with patience").
In other words, I don't know what your husband is thinking, but maybe he deserves some benefit of the doubt, maybe even some credit. Not that we want to encourage folks not to take care of themselves.