Internal shaking / buzzing / vibrating

Went to bed at 1am last night.. Woke up at 1:30 and several times after that feeling too hot and sweating.  Woke up around 5:30 with the internal vibration in my upper body that felt like my heart was racing, it coincided with what felt like I needed to make an effort to breathe.  Got up and went to the bathroom and it was lessened until I got back in bed.  Managed to fall back asleep but kept waking up about every hour feeling hot, sweating and like my heart was racing.  The vibration was rhythmic and I have always thought it was my heart racing, but thanks to another post I read I checked it out and it wasn't my heart.  I felt generally unwell and a bit anxious as well.  After being up for about 10 minutes it was pretty well gone.

... Update: 4:00

Took a nap around noon and woke up at 1:11 with the buzzing feeling, but to lesser extent and not quite as hot.  Didn't feel as panicky.  Went to the bathroom and went back to sleep, woke up at 3:30 with buzzing and hot but not so panicky.  It went away within a minute of being out of bed.

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