What should I do about my fear of the unknown and my claim of being subjected to a magic spell, especially since everything is available except a wife, and illnesses like high blood pressure and diabetes have appeared since two years ago?

Treating fear and anxiety involves relying on Allah, trusting Him, and having complete reliance upon Him, along with a firm belief that all matters are in His Hands. There are beneficial supplications (adhkar) and protective incantations (tahsinat), among them the saying: "I seek refuge in the perfect words of Allah from His wrath and punishment, from the evil of His servants, and from the whisperings of devils, and from their presence." It is also recommended to read Imam Al-Nawawi's book on adhkar. Furthermore, one should not believe in the influence of magical acts, but there is no objection to seeking a righteous shaykh for ruqyah al-shar'iyyah (Islamic exorcism/healing).