advice please. I'm confused.

Every test I take comes out negative, yet I have symptoms. I can smell just about everything, and I always ask my husband if he can smell it to, and he always says no. I am always super exhausted, I feel nauseous, but I never throw up, I have light cramps here and there in my lower abdomen, and my appetite has changed and my cravings are not what I usually eat or drink. Any advice on why I might feel like this but get a negative test.?