My friend did the "back walk massage" on me with her full weight on upper back and lower back and the very back of my upper thighs. I had lower back pain right after, then felt fine the next day then the following day I felt kinda weird. I felt almost weak at times with kind of a pinched nerve feeling and crampiness in different parts of back and upper leg area at different times. She also really dug her heels into my upper back, shoulder area. My back also made a slight creaking/crack noise when she stood on middle of back. I was not aware that she is about 30 pounds heavier than me.

Is that safe to do? I Read (after the massage) it can cause blood clots and ect. Also how is it bad for kidneys? Think I could have a pinched nerve?