it sounds like your body is not used to the position you are placing it in. A slightly easier position will help with that.

Exercises to help posture will also help as in the Egoscue method (which some people practice alongside yoga). egoscue look at posture to identify the sequence of exercises needing to be done. Link shows a handy book cover giving you the front and sideviews compared to alignment markers https://www.amazon.com/Crooked-Body-Joints-Line-principles-ebook/dp/B086RVMSKV .

You would need to see if your posture has changed position to determine if that is the reason for these sensations. Here is a picture of the human design blueprint

https://www.amazon.com/Crooked-Body-Joints-Line-principles-ebook/dp/B086RVMSKV

You don't have to buy the book to use the information in the picture.

In the Egoscue method, posture changes as muscles are shifting the bones. That means the direction of pull and the amount of pull being exerted by various muscles is changing. Also some are pulling harder than before and others may be being stretched a bit to hold the changing position. So, there can be various sensations as a result of that. The Egoscue method is a non-meditation posture alignment system, by the way.