What is the ruling on the prayers I have performed, and must I repeat them if I strongly suspect the emission of pre-seminal fluid (madhy), while still having doubt about it? And must clothes, blankets, and bedding be washed if they have been touched by impurity, and I am not certain of that?

It is not obligatory to perform ghusl for the emission of madhy (pre-seminal fluid); rather, it is only obligatory to wash the clothes that madhy has stained due to its impurity. It is not obligatory to wash the abaya, blanket, or bedding unless one is certain they have been stained with impurity.

If the wetness mentioned is not madhy, due to the absence of anything that arouses desire, then it is most likely sweat or vaginal discharge, both of which are pure, and your prayer is valid.

If you prayed with impurity out of ignorance, your prayer is valid. It is advised not to give in to obsessive whispering (waswasah).