SICK AS H*LL!

So I just started a health journey. I've done this several times & life but it's obviously never lasted since I've "started" one once again. ANYWAYS for the past 36 hours I've been sick as a dog. I've had thing on going headache, nauseous, dizzy, and having hot flashes. I PROMISE YOU THAT IM NOT PREGNANT because my period just ended last Friday. Now I have this weird light pink discharge but that's besides the point...I think. But I've never had a change in diet treat me like this. It's treating me like I am pregnant or have the flu or something but I don't. I know my body is obviously reacting to this change but gosh why so bad? & what can I do to fix this because I can't go on feeling like this.