Yes, Mining bitcoin is worth it. If you're willing to wait until you recover your investment in buying hardwares, maintenance and electricity. Actually building mining rig is not for a simple investor because you really need a high amount of investment and patience as well.

I also live in PH and just like what you've said the electricity bill here is a little bit high, If you're going to invest money why don't you try trading or investing to ICO's? since you can easily earn once the token increase price or the coins you bought increase it's price sometimes you can instantly earn profit in just a matter of time unlike the mining you need to recover the electricity bills you paid, investment to hardwares and maintenance. But to answer your question yes it's worth it if you have a lot of investment.

Remember to invest only what you can afford to lose and don't take risks if you're afraid to lose your money/investments.