Hey Sandra, let's unpack these:
1. The cancer case: hyperthermia isn't a symptom here, but a therapy given in special clinics. It's meant to create conditions in which the cancer will recede (basically like a generalized inflammation). I think it may have aggravated certain symptoms she had such as oedema. The ((Digestive - Visceral Fascia - Peritoneum|peritoneum)) is CB-related, however her belly, like a reminder of a harm, reflected her wish for a baby which they had put aside.
She basically didn't get all her needs and values met by her partner, and by trying to push him, they both didn't meet each other's values. Their relationship was not an optimum fit, the expectations were quite big on her side.
For the tumor to shrink, the "attack against the abdomen" needs to be resolved, both in her memory and cell memory of the surgery, and metaphorically the attack she may have felt by having her baby wish denied. She also needs to feel connected and cared for, in order to avoid ((Urinary - Kidneys - Collecting Tubules|KCT)) activation.

2. Lower back pain: yes, according to your description I'd say a "KCT syndrome", a regeneration/resolution trigger of a self-worth issue about their personality or identity may have set off the inflammatory swelling response at the lumbar spine, aggravated by water retention activated by the belief "no one listens to me, my pain doesn't matter".

3. Sciatic attack: this is described as an irritation of the nerve usually by compression. It can happen when the discs are degenerated by taking on too much load with too little alignment (which would reflect a long stress phase of self-neglect) and by muscular imbalance. Also, a resolution of this stress can set off the attack - this time the compression would be by oedematous processes in regen A. So yes, you are completely right!.