How can one overcome the whispers of doubt regarding the existence of God and the necessity of worshipping Him, which have led to a decline in studies and social relationships, feelings of hypocrisy and disbelief, and an intense desire to return to God?

Ward off the whispers (waswas) concerning matters of faith and strive against them by seeking refuge in Allah and saying, "I believe in Allah." You are upon great good as long as you strive against them, and you will be rewarded for that. Repent to Allah from listening to unlawful music, and attend to what benefits you in your religion and your worldly life. Strive earnestly in supplication that Allah may grant you a tender heart and avert these whispers from you. Your hatred and aversion to these whispers are proof of the sincerity of your faith. Consult a trustworthy female doctor to comply with the Prophet's (peace be upon him) recommendation to seek treatment.