Hi Rob a very warm welcome to BTG
I used to get very strange sensations too....I was clipped. It was only when I found this Forum that I found out others were creaking, squelching and feeling like spiders crawling etc. It's the mending of your brain and the blood dispersing and also bone, muscle, nerves repairing. I found it very scary at first. As Macca has said, its always best to seek medical advice just to be on the safe side.
Glad you found us and wishing you well.