I went vegan for 6mnths last year along with a few fasts, any discomfort you might experience is a healing crises due to toxins being released, most animal products are full of antibiotics (80% of antibiotics made are fed to animals). Giving up dairy will help clear up your lymphatic system, but again you might have withdrawal symptoms, the main protein in dairy is casein which creates a stimulant(casomorphin), when eaten that stimulates the same receptor in the brain as heroin.
Gluten is the only protein the human body can not digest and stops the absorption of nutrients (the name itself is derived from the Latin for glue).
Well done for giving it a go, you might feel crap for a while, but push on through and you will find your taste buds will change and the health benefits you will feel after a while will amaze you, stick at it for at least 2 weeks you wont regret it, good luck !