Hello and welcome to HCM,
The symptoms that you have mentioned pertain to different organ systems.
Low back pain is due to spinal problem or
musculoskeletal pain. The cause will be determined by MRI of the spine.
nausea, flushing, black outs suggests disorder of sympathetic system.
Pheochromocytoma is one of the disorders associated with these symptoms.
However, a negative test for 5-HIAA rules out the possibility of pheochromocytoma.
There are others conditions associated with these symptoms.
There are some food items which cause these symptoms.
A detailed history and complete examination are required to diagnose this condition.
Lack of energy,
dizziness, fatigue are commonly due to anemia. Anemia occurs due to low
hemoglobin. Get your hemoglobin levels and RBC indices to know the status of your blood parameters.
Thanks and take care
Dr Shailja P Wahal