A lower eyelid botox injection caused pain and bleeding. Is this normal or should I be worried?

The good news in your situation is that Botox wears off over time. It sounds like you had some bleeding with your injection which happens from time to time. I would follow up with you injector for a recheck and to discuss your concerns.

It may be likely that the Botox may have caused the lower lid drooping. You should speak with your physician to allow them to work with you as this resolves. Remember to keep your eyes moist with artificial tear drops, if you are experiencing any dryness due to this as well.