I did have amnesia to the point of not remembering the other couple of days and even weeks.
However, that was before I started to take antidepressants. I am better doing now.
I did have amnesia when I did drugs in childhood too. It has gone long time ago, though.
Take care. You can of course search for this drug side effects on the Internet and see if it causes amnesia.
When you feel all alone and unhappy, turn to you Inner Child and talk to Him.
You will see He can comfort you like nothing else!