My dumbass car

What is the "epc"? You said you add coolant when the light comes on. Light for what? Some cars have a low coolant level light in the reservoir. That would be you responding to a minor problem. Some cars are too cheap to have a temperature gauge; they use a "hot" light instead. If that's what you have, that light is there to tell you damage has already occurred. If that happens enough times the cylinder head could warp and / or the head gasket could start leaking. That alone can lead to overheating, and if it's bad enough it will cause a rough running engine.

If the generator quit working, there could be coolant that has sprayed onto the belt and is causing it to slip. I'd look for something minor like that before I'd assume the problem is serious, but most engines can't stand up to repeated overheating without some negative consequences.