Is your sim card from philippine provider? If so, it is very easy to have your sim card replaced as long as the sim is just recently lost. If it made any transactions within the month, text, call or load, then just go your telco outlet and have them replace your sim. It is free.
I'm afraid that's easier said than done, lots of information will be asked, like when or to whom the last SMS message you received and sent, even the sim card holder which is called the sim card bed is very important as well which is tinatago ko talaga yung ganyang bagay.
I tried to change my sim card before since it was damaged but the thing is I still have the previous one so, may mga info pa ako like SMS messages, since there's a gcash account linked to that number so it was processed ka agad.
Well, if still alam mo ang mga ganyang info, I suggest go to some of the telco outlets which was mentioned asap, mostly nasa mga mall yan.