That system you probably put in your car probably blew your alternator. Back when I was younger and used to think having the loudest system in the city was cool I blew so many alternators on my buick. Until my s**t got jacked and Ive never had subs again, not worth it. That s**t makes your car a target for boosters wanting easy-liftables from your trunk or cabin.
Anyways, with that many miles, have you thought about seeing how much you can get for selling the whole car? maybe sell the car and see what other kind of civic you can find for that money? You could probably find a lower-mileage engine, and a car without a service history that you could pickup for cheap and start with that. I mean if the cars going to be going to the shop all the time, why waste time with it? Ive found that its going to cost more to be spending money on a car free or cheap car to keep it running then the upfront spend a little more for a car that wont be going to the shop and is going to be nicer overall.