I’ve just been through the same process. Had my cells harvested on Monday and Tuesday this week and the injections from last Thursday. Bone pain is one of the side effects they warn you about. I had no side effects Thursday, mild back ache Friday but Saturday was more severe back ache and yes I know what you mean about it not being like the normal backache. It felt better if I walked around and kept busy rather than sitting. It was milder on the Sunday, then even though the hospital gave me injections on the Monday and Tuesday , harvesting days, I didn’t feel any side effects. I hope it eases, but be assured it should be expected. Contact your haematology team if you think it’s too extreme of course. Best wishes for the harvesting and transplant. My transplant is 30th April. Glennis x