I need some help with power in my home!

This is a vulnerable question. I've been doing this hobby for way too long to not know the answer to this. I have seen lots of products marketed for power, but I've never had the need. But here we go...

The power in our house is really unstable. Lights flicker when I turn on the kettle. The space heater nearly takes us down. 

Is there some sort of regulator type thing that stores power and sends it safely and consistently to my stereos? Like a block that sits between the wall and all of my components?