Forehead Froze After Massaging Botox, is This a Common Side Effect?

I cannot imagine or provide any seqeunce of events which could explain the symptoms you describe. It is difficult to imagine Botox wearing off suddenly after 5 weeks.

It is  highly unlikely that you caused the Botox to migrate after so many weeks. I would suggest you see your injector or doctor for an assessment. 

It is not conceivable that pressing on your Botox area five weeks after its injection altered its effect.  You might want to see your doctor to be examined and determine what had developed.

Pressing your forehead five and a half weeks after your Botox injections would not alter its effect.  You should return to your physician for assessment.  It is possible that you require Botox in additional areas.

This sounds like an unusual situation that should be directly evaluated in person by a board-certified dermatologist or plastic surgeon. Botox works as a muscle relaxant and does not cause muscle spasm. If PROPERLY given, and effective, it starts to work to weaken muscle action in a few days, and has achieved its maximal effect by 2 to 3 weeks. After that, it should last 2.5 to 3 months. But the effect is an inability to tighten muscles to create the frown lines. If your lines are still there, it may be that the muscles are weaker, but the lines were deep enough to begin with that the full softening effect can only be achieved with perpetual use of the neuromodulator to let the lines soften by themselves over time.

If you pressed a muscle or nerve hard, and it spasmed tight which you felt down your nose, this may be a result of the direct trauma rather than the Botox. In any effect, do not get more Botox or any neuromodulator, or any injection of filler, until this has been thoroughly investigated in the office, preferably by the physician that originally gave the Botox.