Welcome to HCM,
I think your problem to have sex with your wife might be due to having weight 98 kg.
As age advances there is depletion of male hormonal level can also giving this problem.
Reduce you weight to about 70 kg.
Rule out diabetes
as this also a contributory factor for having sex problem.
So now at this age go for,
1, blood sugar estimation.
4,If require testosterone
After all reports go for treatment accordingly and you will have satisfactory sex performance.
Ok and bye.