Help! Blossom drop

[Kristinashato]

Hello! I am attempting to grow mini bell peppers indoors. The plant is located by a south/west facing window where it is very warm despite the winter (I live in Toronto, Canada). There is a balcony door a few feet away. It seems to be growing very well and there are two peppers that are maturing. Lots of leaf growth and lots of flowers and buds. However, once the flowers have opened, all of them (except those two) fall off the plant. I’ve been careful with water and move it into the shade when it gets too hot. I thought it might be because of the balcony, so I moved it away a little. It keeps growing more leaves despite the blossom drop. The dropped flowers appear to have small peppers inside? Attached is a photo. It’s a little droopier than usual today. Please help!

 

[Kristinashato]

I also should’ve mentioned - I have been hand pollinating by shaking the blossoms gently