Found an injured sparrow, it can fly but it bangs into the ceiling and it keeps its eyes closed :( not sure what to do

Found this sparrow near my house, I live in Singapore. The sparrow flew once but hit the ceiling and fell down, since I’ve made sure it doesn’t fly away. It keeps its eyes closed and opens when there’s a suddenly noise or when I pet its head and just remains sitting like that. Doesn’t want to eat and I believe it drank a little water. There’s white poop a few times. Not sure what to do, I want to help it :( I’ve placed it in a box and also placed a very slightly heated gel pack for it.