OP, you wrote: “He’ll force me into medicine and I’ll be miserable for the rest of my life.”
I have a little story about a US friend of mine who had a similarly controlling father. My friend wanted to major in computer science and his father demanded he become a doctor. He felt he had no choice but comply. He went to medical school but spent all his free time on computers and built a website for fun in his spare time. He eventually became a doctor–a specialist, actually-- but kept his website going. He had incredible luck, though, with his website and it became extremely popular. At one point during the dotcom boom valued over $50 million and he was on CNN. When he was making more money from his website than from his medical practice he told his parents he was quitting medicine. They were, finally, ok with it. He’s been happily devoted to computer work for the last 15 years or so.
I know his story is extremely unusual and he was very lucky-- and it was likely easier to do in the US. But don’t let your father’s control of you extend to control of your life and happiness. You don’t have to be miserable for the rest of your life. It sounds like he will fund an education. In the worst case scenario, you could follow your father’s demands and find a way to combine it with your interests. The world can use medical doctors with CS interests and training, for innovating new medical products and improving patient safety.