Can i go to clinics(K1M, private clinics, etc) to treat my clogged ear or must go to hospital?

clinics can. better go private clinics. but not sure if all clinics have the service. depends on your clogging i guess. if too hard the clog, they need to water down the clog and then you need to come back to use some type of water spray to remove the clog fully.

How it got clogged?

The water got in when i took a bath. The water may have mixed with the earwax and somehow blocked my ear.

You may also have ear pain, dizziness and muffled hearing. ... If your ears are plugged, try swallowing, yawning or chewing sugar-free gum to open your eustachian tubes. If this doesn't work, take a deep breath and try to blow out of your nose gently while pinching your nostrils closed and keeping your mouth shut. https://www.mayoclinic.org/diseases-conditi...rs/faq-20058092

how long already?

if only a short while like a few hours then can try add more water and tilt and shake your head. all the water will go out together.

1 day and a few hours already.

K1M will only give you eardrop to soften the earwax. It did help me when my ear was blocked last time but it took a few days.