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.