I have a lion’s strength and a scorpion’s sting, A creature of legend, with a deadly wing. What am I?

Not from a sheep but a plant, I might help you sleep if you pant. My history is steep with respect that was scant.

Allegedly born from a Bell, A mixed truth they tell. I aged and learned new things, leaving behind my strings. I pass your secrets unbroken, and speech never spoken.

An ancient tongue, known from the start. Mastered by none, practiced as art. My words are spun to affect your heart.

I am old and everyone has heard of me or met me. I visit family and friends but nobody ever likes me. I'm forever an unwelcome guest, even though sometimes I'm the only one who can make things better for someone.