Subaru Christmas tree Dashboard

I have a 2010 Subaru impreza with 200,000 miles on it. I had bought the car
with an overheating problem so i have had a lot of things replaced in the
front end of the car( Head gaskets x2). Anyway back in September i went to
pass a guy on the highway, when all of the sudden my dashboard lit up (
check engine, traction control, cruise blinking, ABS brake light, AT OIL light
blinking). When i shut my car off ABS and AT OIL light turned off, and return
once in a while. A month after that my oil lamp came on, went to auto zone,
the guy said I was completely out of oil. Since then no AT OIL light has come
on. My headlight and brake light was out, and heard that could cause check
engine light ( don't think that's true). Bought a new gas cap, only made it
worse. I went and got the codes read, and the guy said my air intake
chamber needs to be cleaned, but that sounded expensive so i just replaced
my air filter, since then my car has run better, and no second set of lights.
But i still have the main ones ( Check engine light, cruise, and traction) I
don't know what else to do, I don't want to spend more money on something
that may not fix this issue.