Otherside
I'm not really sure about the dreaming/not really there one but the other ones sound a lot like anxiety symptoms. Nausea is pretty common for people with anxiety, as is a constant feeling of dread.
Hot flushes/suddenly feeling got is not something I've ever experienced, but it's not unheard of.
As for how to make it go away, there are some exercises. Breathing exercises could help when it happens (breathe ib whilst counting to ten, hold whilst counting to ten, breathe out whilst counting to ten is one I can think of off the top of my head. The idea being that you manage to distract yourself with it by focusing on your breathing and counting to ten, I think). There's also mindfulness exercises (if you do a google/search on YouTube you'll find some, but if you learn how to do it, you can do it by yourself).
Or there is the medication option, if you feel that it's unbearable and that non-medication options aren't helping. I can't tell you whether that's a good idea or not. If it comes to that, you'll need to way up the pros/cons of that yourself. There are some over-the-counter options available - some herbal stuff has been shown to help with anxiety symptoms. Other than that though, you'll probably need to see a doctor for that.
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