2 days back I met with a small accident. An iron window fell on my head and the glass broke on me. The wound on my hands and thighs are treated, but I had a small swell on my head (exactly where new-born head is soft or the so called for fun, off-button). The doctors said its nothing and asked me to ignore... I have a mild headache and my head feels heavy. Even though the swell has reduced, it hurts when I touch my head,, in fact, it hurts when I raise my brows...
Apart from that, m fine,,

Might be psychological, but I feel m getting slow, i.e. losing concentration,, losing control over my hands, eyes,, though its not strongly,,

How long should I wait for the pain to go away? Any symptoms I have to look out for? Any other suggestion?

I suspect that given that you are online doing a lot of typing, that your symptoms are temporary. Wait several more days and assess the situation again. Also, are you taking anything for pain?

Nothing,, since the pain is mild,, m not taking anything,,
My head feels heavy...

My guess ( and it is a guess) more worry and stress over the worry.

Of course it is never wrong to get more tests if you want them.

It might be stress,,

viral fever everywhere,, my mom and husband both have it,, m stressed taking care of my daughter, making sure she doesn't go near them,, and also taking care of them both,,

My mom had something same sort of accident but it was a car accident... when she thrown by jerk to main glass of car... whole that glass was broken... my mother had severe injury... but she is totally fine now... id would pray that u feel fine soon...
Believe in yourself... trust yourself...
Say to yourself... :no I'm not getting slow... I m fine... id m myself capable of facing worst things... and does this injury dare to touch my will... nothing can in this world... nothing can even dare to harm me without my permission... ''
Get well soon... need u most