I'm trying to find out more about this sensation I had during a time where I was especially stressed and trying to suppress urges to overthink. Is it something that all people who have anxiety face? 

It was something like this: I was aware of 2 separate beats in my head going at different tempos, one deliberately slow, and the other rapid-fire. I remember it being very loud and overwhelming in my head, the same way a thought could be loud in your head, but I can no longer remember whether I could feel it physically so I cannot be sure if it was my heartbeat (but it's also not possible that I would have 2 heartbeats...). It was definitely not a real sound that you could hear with your ears. Slightly alarming and I thought I was going crazy, yet it felt distantly familiar because I suddenly remembered feeling this same sensation when I was a young student in high school.

I have no idea why it happened, or what this is, and I cannot find anything about this online. If I don't have any answers it's okay, but I would like to ask, does anyone else experience this or is it just me?