A typical band like this plays at 105 to 120 decibels sound pressure level. Your employer at your day gig would be required by OSHA to limit your exposure to this volume level to one half hour or less. Longer exposure times will result in hearing loss. Turning down would be good, but we know that's not going to happen. Lars Ulrich of Metallica and two of his band mates wear ear plugs.
Some people think ear plugs are for wimps.
But if you don't want to hear any records in five or ten years, that's your own decision. The best ear plugs are custom molded to your own ears, and are able to offer around 15 to 25 decibels of attenuation with a nearly flat frequency response. Until you save up the money, the foam type you buy in the hardware store for less than a dollar actually work really well for hearing protection, but they are not flat at all on the frequency response. Good ear plugs will actually help you to hear your own playing and others better by cutting down on the distractions caused by the high sound levels. Your ears will quickly adjust to the differences and you will definitely enjoy not having your ears ring after a gig.