Is it regarded as disclosing sin to tell the doctor about some of his sins?

Living in an apartment that his father bought by riba

Her husband gave her a mahr of a car that he bought by means of riba; now he wants to take it back so he can buy another car by permissible means

She has been living with a man for several years and she wants to do Hajj then go back to him

She committed an immoral action with a young man, then he left her; should she wait for him to marry her?

He committed zina with her, then he repented, and he is afraid that she may harm the baby; what should he do?

Is it permissible to make use of money acquired by haraam means to relieve his financial hardship?

If a person is persisting in minor sins, will praying for forgiveness be of any benefit so that they do not become major sins?

He wanted to help a woman become Muslim, then they committed zina and she got pregnant, then she insisted on leaving him, and cut off ties with him

Will the repentance of one who impugns the Prophet (blessings and peace of Allah be upon him) be accepted? And is it better to admit it to the qaadi (judge)?