Here's an interesting list of some of the symptoms of magnesium deficiency that's slightly different from ones I've previously seen:
"Due to the numerous functions of magnesium in the body mentioned previously, magnesium deficiency generally causes several symptoms at a time. Therefore it is called magnesium deficiency syndrome (also tetanic syndrome). Symptoms can be multifarious: Prof. Dr. sc. med. Roland Fehlinger, neurologist and psychiatrist, founder of the self-help organisation Mineralimbalancen, published the most common symptoms of the tetanic syndrome (syndrome = the typical coincidence of different symptoms) in his brochure for patients. The list below contains the symptoms most commonly named in a patient self-assessment based on a rating scale using a questionnaire with 86 symptoms:
Irritability
Tiredness
Rapid exhaustion
Inner restlessness
Cold feet
Headaches
Weariness/lack of energy
Sensitivity to noise
Brooding
Numbness in hands and feet
Excessive need to sleep
Palpitation, tachycardia
Weakness
Backaches
Muscle cramps, e.g. calf cramps, spasms of the masticatory muscles, twitching of the eyelid – they are considered the cardinal symptom."
The source is from Prof. Dr. sc. med. Roland Fehlinger, neurologist and psychiatrist, founder of the self-help organisation Mineralimbalancen, and the website:
http://www.magnesiumhilfe.de/faq.php?q_lang=en#Changes .
Under the above symptoms, the website goes on to say:
"Prof. Fehlinger declared that patients had particularly complained about a very unspecific "irritable weakness", which is often the result of overpowering depressions, anxieties, panic attacks, but also of an agonizing search and brooding of whether a serious illness may lie behind all this (hypochondriacs).
"But magnesium deficiency, i.e. the tetanic syndrome (magnesium deficiency tetany) – if not detected, not recognized nor treated – is an illness that must be taken very seriously. The testimonies of patients having an unreasonably long history of suffering show that this illness is not taken seriously enough. In the opinion of affected patients, the reason for this lies in the fact that this clinical picture is not given enough priority in medical education and training.
"It is important to know that the forms of manifestation related to tetanic syndrome change with age.
"In infants you will find labor complications, mild failure to thrive, susceptibility to infections, increased propensity to develop cramps (teething and febrile convulsions) as well as delayed dentition.
"Manifestations of magnesium deficiency in grade schoolers include concentration and sleeping disorders, "nervousness", abdominal pain and headaches, collapses; in children 10 years and older, muscle cramps; in children over 15, a feeling of constriction and laboured breathing. Girls often have a delayed onset of menstruation and menstrual pains; sometimes there are also irregularities in the duration of cycles.
"The symptoms in adults include rapid exhaustion, increased need to sleep, anxiety, depression, muscle cramps (in the calf muscles and in t he vascular and visceral smooth muscles), headaches, migraines (diffuse and/or migraine-like headaches are very common), discomfort of uncertain origin in the upper abdomen and stomach pains. People aged 30+ tend to also suffer from typical tetanic spasms (obstetrician's hand), and those older than 40 also have neurologic deficits called TIAs (transient ischaemic attacks) leading to temporary disruption of the blood flow to the brain.
"Muscle weakness is often much more distressful to patients than muscle cramps. The classical tetanic seizure, i.e. the continuous spasm of the body including the lip muscles, occurs in not more than 20 percent of patients.
"Women tend to develop pregnancy complications such as vomiting, edemata, protein in the urine, high blood pressure (pre-eclampsia and eclampsia) and miscarriages."
~ Holly
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Like many others here, after my symptoms began I found that I could cry at the drop of a hat, or a pin, or just thinking about dropping a hat or a pin, for that matter. 
Magnesium included!!
