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Dude you need to cut down on your protein shakes. As the body can't absorb much protein in a given period.
Also have a peppermint+cucumber smoothie to help with your diarrhea.
Too much protein...

Ice berg
Greek yogurt
Finely diced peppermint leaves
Pickled cucumbers
Roasted and crushed cumin seeds
Salt
Tomatoes
Olives
Lemon juice

I don't know much about bulking but couple of figs with a glass of milk do help it. On the plus side, figs help increase endurance.