Denial of sex by husband

I'm married for 10 years and in the first 3 years my husband only had sex with me at the intervals of sometimes 3, 6 and 8 months. He refused sex in every possible way. He accused me of having a more than normal sex urge and said that this is what is normal for him. I tried to make him understand in every possible way. Tried to make him read articles and told him that it was painful for me. He used to push me hard if did try to touch him in any way. After 3 years I stopped trying as it was very humiliating and we did not have sexual intercourse in 5 years. Not a single time. After 8 years he admitted that something is not right and he will consult a doctor. But it took months for him to decide which doctor he wanted to visit. Then he decided to visit a psychiatrist and told him that he has some erection problem and he thinks it is due to stress at work. The doctor suggested to take small vacations and keep the phone switched off during weekends and he gave medicine for the ED. My husband did not follow his advice and took a few months to buy them and even after that he did not start having sex. I'm 37 now and want a child. But he keeps himself busy during this lockdown with his work for almost 16 to 20 hours sometimes as he is working from home now. And even before or after that he doesn't take any initiative or shows any interest. Even in weekends it doesn't change. My gynecologist also suggested that we should try atleast in the alternative days during my ovulation but even after my giving him reminder he does not have sex more than 3 times in 5 months. And during those tries he couldn't ejaculate. So I repeatedly request him to visit my gynecologist and tell her the problem, but he doesn't have time for that. I'm married for 10 years now. And I'm being denied of sex for all these years. I want to file a case for this cruelty. How do I proceed?