Its fine and anticipated.
The burst of Unravel is really very small. The entire area, afterwards, radiates high planar sickness. Entering the portal itself generates a much higher amount of planar sickness and that cannot be avoided if you hope to benefit from the spell.
Beyond that uses per day are the real limiting factor. The idea of planar sickness isn't to limit arcane magic so much as to make people hate you.
The burst of Unravel is really very small. The entire area, afterwards, radiates high planar sickness. Entering the portal itself generates a much higher amount of planar sickness and that cannot be avoided if you hope to benefit from the spell.
Beyond that uses per day are the real limiting factor. The idea of planar sickness isn't to limit arcane magic so much as to make people hate you.