@cakefood first of all, sending you good thoughts. You're going through a lot of things, so give yourself a big hug (mentally or literally if that feels like something you want to do).
When I'm spiralling with the health anxiety a few things work for me, but sometimes none of them do.
Sometimes I'll actually indulge in the spiral and be like, okay, let's say that it really is Worst Case Scenario. What then? And make a list of everything that would need to be done/would probably happen/would scare me. Seeing it written down, and actually writing it down, can take power away from it. I can sometimes then see the extremely unlikely scenarios for what they are. Or resize my fears.
Sometimes I'll act tough with my anxiety and be like, okay so what? If I'm dying and dying and why wouldn't it be me? And sometimes that helps.
The thing is that without your husband to talk things through you might also need another outlet. Is there a friend or relative who could play in the role your husband usually does with your anxiety? Like if he listens, a friend who'll listen. If he offers solutions, a friend who'll do that.
Alternatively, if it's within your budget/if it's feasible with your health insurance, seek a professional. You mention you've done CBT for generalized anxiety disorder but that it doesn't work for your health anxiety. Perhaps seek a different type of therapy to see if they have more tools for you. I've done hypnotherapy with a licensed psychiatrist and it's helped with my health anxiety, but I know others have benefitted from psychotherapy, etc.