Help?

Hi. I sometimes think about something too deeply(ie death, what happens after I die, that kind of stuff), and I start to feel sick, or I feel dizzy, or I just feel something that isn’t my normal self. On rare occasions I’ll start to shake. My mind will race with too many possibilities about what could happen in the future, and by the way some people describe anxiety attacks, I feel like what I go through could be something similar? I’m not saying I do have anxiety attacks, and I haven’t been diagnosed with anxiety, I’m just wondering if it’s some sort of variation of one?