"Magnesium is important to the body, and so low magnesium can cause a host of problems, such as:
irregular heartbeats, loss of appetite, insomnia (a killer for migraineurs!), weakness, shortness of breath, PMS, anxiety, dizziness, nausea, and poor coordination."
I had all of these symptoms before and during the first 6 months of NB. Most of these have resolved now into 14 months of NB.