Girls, hello ❤️ We're 6 months and 20 days old. The baby doesn't react…

Girls, hello ❤️ We're 6 months and 20 days old. The baby doesn't react to sounds even loud ones. Doesn't look. Roughly a month. Constantly sticks his fingers in his ears. Before that, the baby was scared if someone talked loudly, sang songs in his own language together with me. Went to see a speech therapist today, she said there is a serous plug, on the machine the test didn't pass. Is it possible for the baby not to hear from this? She prescribed drops, I will drip them. I am very worried. Could you have encountered something like this?