@325563354adrvgf it's not the same worry all the time, you worry about EVERY little ache and pain and ALWAYS imagine the worst. You can have a simple cough (could be lung cancer), a headache (brain tumour), pain in your chest (heart attack). You're prone to catastrophising and can't help it. It really is an illness. I do feel for your DH as it's frightening and exhausting having these thoughts and worries constantly, they feel uncontrollable.
He definitely needs to see a counsellor face to face and he needs to stick with it. The counsellor can't 'cure' your anxiety, they help you rationalise your thoughts but that doesn't happen over 1/2 sessions, it's a process. Them asking question he perceives to be unrelated to his anxiety are all part of the process in helping him to understand and deal with his thoughts and feelings.
He also needs to be willing to help himself and not just rely on others. He could be doing breathing techniques when his anxiety is heightened, this will help calm his mind and body by slowing his heart rate. If he isn't on medication then I would recommend he see his GP and explain how he's feeling and how it's impacting on his daily life and his relationships. They will probably prescribe an appropriate medication (these generally take up to 3 weeks to get into your system before you feel the benefit so shouldn't be stopped or written off to soon).
There aren't any support groups for partners that I'm aware of but you can self refer for counselling of your own to talk through how you are feeling. Ask your GP for details of services in your area if google isn't throwing anything up.
My DH is just very reassuring when I'm stressing about something (his reassurance doesn't make me feel any better to be honest). I think because I was actively trying to help myself he could see that I was trying and was really supportive and understanding on my bad days.
I really hope he gets the help he needs as he doesn't have to suffer the way he is and nor do you
if you want to ask anything else then please do x