Pretty bad actually, but I'm still lucky. The DSL repair man said that there are about 4 other houses in our neighborhood that got affected, and the comps in those houses - some ceased functioning completely.
Damage to my PC is the monitor (it now has 5 minute delay before turning on). And the LAN port of my board got toast. Thank goodness it's just the LAN, I only had to spend about 300 pesos to buy a USB LAN to fix the problem. If the board got broken, then I would have had to spend over 5000 pesos to get a new pc. Still lucky... I hope this does not happen to your pc.