From the Wiki: Diagnostic criteria
DSM-IV Diagnostic Criteria for Panic Attack
A discrete period of intense fear or discomfort, in which four (or more) of the following symptoms developed abruptly and reached a peak within 10 minutes:
-- Palpitations, or accelerated heart rate
-- Sweating
-- Trembling or shaking
-- Sensations of shortness of breath or smothering
-- Feeling of choking
-- Chest pain or discomfort
-- Nausea or abdominal distress
-- Feeling dizzy, unsteady, lightheaded, or faint
-- De-realization (feelings of unreality) or depersonalization (being detached from oneself)
-- Fear of losing control or going insane
-- Sense of impending death
-- Paresthesias (numbness or tingling sensations)
-- Chills or hot flashes
Note that while the DSM-IV-TR only lists the 13 specific symptoms above, it has been proposed that culture-specific symptoms (e.g., tinnitus, neck soreness, headache, and uncontrollable screaming or crying) be added to the DSM-V diagnostic criteria for a panic attack.
http://en.wikipedia.org/wiki/Panic_attack
Hypoglycemia
Hypoglycemic symptoms and manifestations can be divided into those produced by the counterregulatory hormones (epinephrine/adrenaline and glucagon) triggered by the falling glucose, and the neuroglycopenic effects produced by the reduced brain sugar.
Adrenergic manifestations
-- Shakiness, anxiety, nervousness
-- Palpitations, tachycardia
-- Sweating, feeling of warmth (although sweat glands have muscarinic receptors, thus "adrenergic manifestations" is not entirely accurate)
-- Pallor, coldness, clamminess
-- Dilated pupils (mydriasis)
-- Feeling of numbness "pins and needles" (paresthesia)
Glucagon manifestations
-- Hunger, borborygmus
-- Nausea, vomiting, abdominal discomfort
-- Headache
Neuroglycopenic manifestations
-- Abnormal mentation, impaired judgment
-- Nonspecific dysphoria, moodiness, depression, crying, exaggerated concerns
-- Negativism, irritability, belligerence, combativeness, rage
-- Personality change, emotional lability
-- Fatigue, weakness, apathy, lethargy, daydreaming, sleep
-- Confusion, amnesia, dizziness, delirium
-- Staring, "glassy" look, blurred vision, double vision
-- Flashes of light in the field of vision
-- Automatic behavior, also known as automatism
-- Difficulty speaking, slurred speech
-- Ataxia, incoordination, sometimes mistaken for "drunkenness"
-- Focal or general motor deficit, paralysis, hemiparesis
-- Paresthesia, headache
-- Stupor, coma, abnormal breathing
-- Generalized or focal seizures
http://en.wikipedia.org/wiki/Hypoglycemia