Does touching one's wife during ghusl invalidate the ghusl, and is it obligatory to wash the bedding and hands from the effect of mathy, especially considering scrupulosity (waswasa), loss of a foot, and difficulty in performing ghusl?

Touching one's wife does not invalidate the ghusl. Ghusl is a simple matter, and it suffices to pour water over the entire body and run it through the roots of the hair. As for washing the hand after touching anyone, and washing the bed after intercourse, all of this is from the whispers of Satan. The fundamental principle is that a Muslim's hand and the bed are pure until their impurity is proven with certainty.