Yep most horses depending on where you live are starting to shed like crazy including mine! I have just gotten a curry after it( don't curry to much during a grooming if you're worried about to much loss of hair) then a stiff brush and then a soft brush. It sounds like a lot but only do it for about 6 to 7 minutes or less. Then once you feel it's getting to warm spend a lot of grooming time with your furminator or shedding block.
Hope that helps.
"A good rider can hear his horse speak to him. A great rider can hear his horse whisper."