Has the practice of masturbation for 8 years, accompanied by the insertion of fingers and pens into the vagina, led to the loss or damage of the hymen, especially with the presence of intermittent bloody discharge, lower abdominal pain, and changes in the menstrual cycle?

Masturbation is forbidden, and you should hasten to marry whenever possible. Do not let what you mentioned deter you from marriage, for the original state is the intactness of the hymen. You can consult the counseling section of the website to verify if the hymen has been ruptured. If you fear harm, the ruling on hymen repair has been discussed in Fatwa no. 66688. If you cannot go to a female doctor, do not let that prevent you from marrying, and do not tell your husband what you used to do. You must perform ghusl (ritual bath) if semen is definitively discharged, necessitating ghusl, and similarly if you have a wet dream and find wetness. If there is doubt, ghusl is not obligatory.