Weird symptoms

I been being really weird symptoms before my period. It's like a week away. My boob's have been sore, I been feeling really tired, been eating alot more, and recently I been having acid reflux \ heart burn and I been having cramps. Before I go to bed I usually feel dizziness and nausea and hot flashes. I haven't been gaining any weight besides like 1lb so far. And I took a pregnancy test but it comes out negative but it could be too early so. Is it normal to have acid reflux before your cycle becuase this is the first for me. Any advice helps. Thanks!