If Rahu is unfavourable then the person lives in a haze, full of confusion, dazed out, as if driving through fog, smoke.
There can also be irrational fears, phobias.
Most cases during Rahu dasha person sees a mixture of both sides of the illusion. Exploration.
Rahu doesn't have a body of its own so it behaves like the ruler of the house it is in, just more ampilfied.
Rahu in Aries: Mars on steroids.