Everyone who plays the flute should learn singing.
I do not consider my self as having mastered the flute, but I get a real kick out of trying.
It is normal to be nervous.
Running through things because you are familiar with them, breeds routine and this is the seed of boredom.
You can sightread better if you know your scales and arpeggios.
Taking drugs to overcome nerves is the thin edge of the wedge going in there.