Hi and welcome to HCM.
ANameia can cause such symptoms but also pottasium and calcium levels too. You should find the cause of
anaemia first. It can be sign of significant
internal bleeding usually from bowel or
uterus. Muscle spasms are most commonly benign and sometimes the exact cause cant be found. Despite electrolyite imbalance some neurological disorders can cause it as well but it cant be found by
MRI, you should do EMG to evaluate this. WIsh you good health.