I am undergoing a strange period during vipassana meditation (sn goenka guruji tradition). When I am scanning my body there is an extreme stiffness that travels almost throughout the body as my attention shifts and stays in that body part till my attention stays. My body part visibly gets tensed while this happens. e.g. foot and toes are all visibly tense and toes are bent.
In the core of the body I have slightly different stiffness experience. I feel like stiffness wants to rise through the spine and gets stuck in multiple spots and puts lot of pressure on that part as if trying to break away. But then I realize I am not breathing as core moves if i breathe and i am stuck focusing on this rising stiffness. If I breathe at this stage, I get out of this and then stiffness goes away and I stop feeling this and other sensations in my body for sometime. Then as I start scanning again the same stiffness comes back. If I don't breathe this goes till neck and throat region gets stuck in neck and leaves me in pain afterwards.
I am assuming this is usual sankhara coming and trying to observe with equanimity but unlike other sensations that come and go after observation, this one is increasingly capturing my entire body part by part. This has been happening for last one week. Not sure if I am doing something wrong.