What does it mean when you have several hummingbird sightings?

It means there are hummingbirds in your vicinity. That's all. Not all naturally occurring phenomenon are to be interpreted as omens. Often when one something appears in our lives we become sensitised to addition sightings of the same kind. As n example I rarely noticed the make, model and colour of car I now drive until I owned one and started looking for it in parking lots.

However, hummingbird is seen by some as a messenger of love and joy. If you feel hummingbird is significant to your life then this may be the message he carries for you.