My cockatiel got hit by a running fan (URGENT)

He was out of his cage yesterday completely normal. I keep my fan off whenever I feel like it might be unsafe, but when he is just sitting on his cage outside the fan is usually on because he never goes anywhere when he is sitting on his cage. But yesterday he probably got scared of my big black luggage bag as I was moving it and started flying. I saw him go up as the fan was running. I hoped he won't go further upwards, but he went right there and got hit by the running fan and fell on the bed. I went running to check if he is fine. There was no bleeding at all, but he was very scared, shocked and wasn't moving much. I tried to make him comfortable but then I read online that you should leave the bird alone at this time. So I put him back in the cage to make him feel safe. I checked on him all day yesterday, I got up multiple times at night. In the morning, I found him sitting at the bottom of the cage which is the last thing I want to see(that's how my female birdie passed away) and also it's not a good sign. So I put him back up. He is a very active bird. He keep singing all the time. He doesn't stay still. But since the incident, his eyes are mostly closed, fluffy, not eating or drinking, not moving, not making any noises. I can't figure out if he is in shock or he has gotten sick. I tried to feed him some water and calcium, not much because I don't want to mishandle him or force him into anything right now. There's no avian vet around me and also there's lockdown where I live, so can't go out anyway. I am trying to make him feel comfortable. Also leaving him alone for sometime to rest without me being there. What should I do? How long will he be like this and not act normal?