He scrutinises all the bills and claims we cannot afford them.

He wont spend on anything. *

He has become more *obsessed since he retired.

I think this is sounding more and more like a relationship problem
than a diy problem.

Allowing your partner's health to suffer because of a reluctance to
spend money is despicable. Your partner's health and wellbeing should
come *first* above all other concerns.

But perhaps the root of this is about adjusting to retirement (an
early medical retirement?), whilst you continue to work and bring in
money?

Perhaps your relationship is different, but I think for most people
financial planning and spending priorities are mutual decisions.