Doctor, last day we noted in my husband's semen there was light wood coloured small dots. What it will be? Need of worry? It was not blood.

Nothing. Semen can congeal, coagulate and change colors in different ways. It rarely means anything of significance. If he is not symptomatic, it should not be a major problem.
I'd suggest for him. To see a urologist and have a semen analysis. With his weakness and lower belly pain, hopefully there's nothing serious with his genital organs. Take care!
Semen. Unfortunately, it's hard to tell what it is without taking more history and even doing a sperm analysis. He will need to be seen for that.