Any help/advice is appreciated !❤️

Hi ladies

long post*but need help/advice

My daughter has been having this thing where if someone makes her sad she will start crying then shell like kind of hold her breath and her eyes will slowly go back and her body starts loosening , till she gains herself back to cry , this was happening often when she was like 1 she is now almost 2, but the doctor just said to hold her till she gets her self to start crying/breathing again , but this week has gotten to th epoint where after she stops breathing/vrying shell gets herself back to crying for a bit and then just faints for a bit , idk what to do idk if its just part of the tantrum it just scares me so much