Home Electricity problem?

So I've noticed now for about a month my lights in the house will dim and then brighten every few mins or so. (Not lamps tho)

It's not only when my water pump kicks on. It'll do it when it's off as well. I do have a high powered computer but it'll do it when that's off as well.

Bedroom upstairs can't ecen use the light because it'll cut the power in the north and south wall but not east and west walls.

Not sure if related or not but mainly worried about the lights dimming.

I've heard it could be a loose wire that can hear up and start a fire.

I've owned the home for 9 months. It was built around 1993.