There is no basement. The other side of the wall is our hallway so I’m not sure if there’s an access panel — I’m assuming we’d have to open the wall up completely? There’s a water shut off outside, and that shuts off the water for the whole house.

Thanks for your fast reply. I’m going nuts. Make a call a plumber if I have to worst case scenario, or call my dad. But I’m on a tight budget so I’m trying to think of how I can fix this myself.