And here I am ONCE AGAIN wow...

I have really hard time describing my nausea but my friend told me I should be able to if it was real...
I could say I feel some kinda tension right where my throat starts in my mouth and I feel weirdly nauseated. It's been a couple days again and again and it is just different from my usual anxiety (that hasn't happened for a while according to the feeling of my nausea)
Does anxiety nausea change? I'm always scared I might puke because I cannot tell what kind of nausea I have!! I haven't thought about nausea really it just came on it's own I guess..
All I hate today was one 8th of pizza from last dinner and a sub with chicken and cheese and some lettuce on it.
Is this real or how does real nausea feel?!