Hi Jennya,
I think this is a really important question but it can be oh so hard to get information about therapeutic treatments suitable for myeloma patients.
Before Covid, I belonged to a health club which offered massages. One of the therapists there had been trained in what I thought she called ‘Teapot Massage’ but is in fact tpot https://www.tpot.org.uk/ which is meant to be especially appropriate for people with cancer. Obviously with cancer we don’t want to stir anything (bad) up which can be a concern with massages, and I think this is taken into account in the training.
I had one tpot back massage and it was really nice and relaxing but then along came the pandemic and my membership expired.
More recently, I have been going to a reflexologist who has a treatment room on the side of her house and always does a Covid test before I attend for an appointment. I find this is very good for general relaxation and for the management of treatment side effects. I would not say that it works on neck on shoulder tension, which I always have, as directly as the massage did.
As with anything, do check with your healthcare team and I hope you also find the tpot website helpful