Try not to worry, I know that's easier to same than do, but everything may turn out to be ok.
I know it's hard when your OH bottles things up but some people find it easier to deal with problems that way. He may not want to worry you, I know there are some things about my health problems that I don't mention to my wife because I want to prevent her from worrying too much. I haven't told my mum about my cancer or my heart attack because I want her to enjoy her last days without having to worry about my health. My dad died from a heart attack when he was only 47 and my sister's husband has cancer so I know she would be heartbroken to know of my health problems.
Anyway, keep in touch and hope everything turns out ok.