Doctor, i have experienced spitting blood without any coughs or chest pain whatsoever, chest x-ray done, nothing found. what else should i check for?

It is not normal : To have hemoptysis. You need to go see a specialist who deals with this. Usually a respiraotry physician. This can come from anything that connects to your oropharynx - your sinuses, your bronchi etc. They can guide you through this.

See a doctor: Since hemoptysis (spitting blood) could be related to anything from infection to cancer to your sinuses, i suggest that you see a doctor in person (not on the web) for an examination and evaluation. There is no way to diagnose this over the internet.