Husband refuses to get help

Pretty sure my husband has bad stomach issues.

He, no lie, poops 4-6 times a day! And when he does it’s always diarrhea and he will be in the bathroom for 15-45 minutes.

Sometimes he comes out and says it was just gas, but he constantly feels like he has to poop.

I feel like he has IBS or some kind of digestive issue.

He says I’m babying him if I suggest he talk to his doctor.

He claims it’s normal and there’s nothing to worry about.

If I look up the symptoms and try to tell him it could be something more, he tells me to stop worrying.

How do I convince him to see a doctor?