You are now however much below your expected wealth-by-level. The system expects you to have gear evaluated at a certain amount of money. The system does not work well (works even less well) when these assumptions, that are baked into the design of monsters and other challenges, are not met.
The issues from being under the expected wealth level get worse as you get higher in level, and are (far, far, far) worse for mundane classes than for magical classes. Since the item in question was +1 gauntlets and this is a significant portion of your wealth, we can assume that 1. you aren’t very high level, but high enough that it’s starting to matter a whole lot, and 2. you are likely a mundane class and likely among the weakest out there, since gauntlets/unarmed strikes make relatively poor weapons.
That implies that being below the expected wealth-by-level is a significant issue. You may be incapable of adventuring at the level you previously were able to handle. You may be incapable of keeping up and contributing with your party. You may be sidelined until your wealth is restored to the expected values. You may be forced to put the entire adventure on pause, to drag your entire party away from their goals so that you can take a side-trip to recover what you have lost.
Personally, I consider all of that bad for the game. Personally, I do not use things like green slimes that risk derailing the game in that fashion. Personally, in many cases, I consider such results to be a disrespectful waste of everyone’s time (but context matters a whole lot).
The GM is responsible for wealth. The GM is responsible for encounter design. The GM is responsible for understanding the system and the consequences of various events. The GM is responsible for keeping the game moving. Personally, I do not consider these events to have been a great way of meeting those responsibilities—but it depends a lot on the kind of game you’re playing. In a sandbox campaign, this is perfectly expectable—the entire premise of the game is for the party to set their own goals, figure out their own pace, and for the world itself to be organic and reactive to that. These events are just a reflection of the game and the party is empowered to take the time to recover. In an epic, save-the-world quest type of campaign, this is at best a distraction, taking away from the premise of the game.
So the first thing to do is to talk to the GM, and ensure they understand their responsibilities. Make sure that you are on the same page about how wealth is handled—make for damn sure that they understand that you are now below wealth, that the +1 gauntlets you used to have no longer count for anything. Ask what your character knows they can do pro-actively (whether they know places to get replacement gear quickly, whether they have the means to do so, etc.). Make sure the rest of the group is on the same page that you now need to pause the adventure and recover your weapon, or you cannot continue playing as a full, active member of the group (if anyone doubts it, the first enemy with DR/magic would prove the point).
And then do what you have to do—which probably means abandoning whatever dungeon you found the green slime in, going back to town, and buying new gauntlets. Probably you’ll have to borrow money from your party. It possibly means fast-forwarding through a few months of down-time while your character works safe jobs to save up enough for replacements, or at least adventuring under your level for a while.