A really great treatment for shedding hair is Alter Ego Garlic Treatment. I bought mine from
www.sickbay.biz. I also have Nutrine garlic shampoo and conditioner. The shampoo I use sparingly and pay careful attention to apply to my scalp only as it has a clarifying affect on the hair. Perhaps it can also be diluted before applying to your scalp and remember - sparingly.
I also sometimes use an at home treatment I make myself. Here is the recipe - Crush about 7-9 cloves of garlic and mix with about 2 oz of extra virgin olive oil and heat in the microwave for about 20-25 seconds or just hot enough to apply to your scalp without burning yourself.
Put on a plastic cap and keep mixture on your scalp for 30 minutes with or without heat. I usually use heat. I would apply do this treatment as a pre-poo before I shampoo and condition my hair. It smells really strong at first, but as soon as you wash with poo and conditioner, the garlic scent goes away. Ladies, this treatment is amazing and it works. I recommend repeating at least once or twice a week for as long as there is excessive shedding.
ETA: Shedding usually subsides at about 3 weeks of treatment.