Sleep disturbance and intense physical sensations after taking a drop

I took my first drop last night, a few hours before I went to bed. What happened next was thoroughly unpleasant.

After I laid down, I was tired but couldn’t fall asleep. I began to have crazy thoughts and what seemed like waking dreams. Later on, my heart began to beat fiercely, so much that I was worried I had induced a panic attack. Strange sensations all over my body after that, followed by cold chills. After a couple of hours I finally fell asleep.

I took another drop in the morning and felt OK, but I’m scared to take any more.