What is the Sharia (Islamic law) ruling on masturbation?

According to trustful physicians, masturbation is harmful to one`s health, and is forbidden according to the majority of Muslim scholars. Therefore, a Muslim should avoid all that which inflicts harm on him in the life of this world and the Hereafter.

What is the ruling on the cessation of blood after (40) days from delivery, but later continued sporadically during two days of Ramadan?

Once postpartum bleeding (Nifas) ceases, and the woman is certain that it won`t reoccur, then she becomes ritually pure and so she is free to make Ghusl (purificatory bath), pray, and fast. If the bleeding reoccurs before fifteen days from its cessation, and before the end of (60) days after delivery, then the ruling on postpartum bleeding is effective, and her fasting and prayer are null and void, thus she must make up the fasting that she missed and not the prayer during those particular days.

If the menses lasted for over than 9 to 10 days, considered menstruation?

If the duration of the bleeding does not exceed fifteen days, it is all considered menstruation, even if the usual pattern changes.

For passing time, my friends and I have called a famous diviner. She told me that somebody had cast a spill on me not to get married for the rest of my life. I didn`t believe her, but I can`t forget her words. How can I protect myself from such thing?

Praise be to Allah the Lord of the Worlds.

Dealing with diviners is forbidden and what you are suffering from is due to your having consulted that diviner. Have trust in Allah and ask Him for forgiveness, but rest assured that whatever Allah has decreed will take place. And Allah The Almighty Knows Best.