Hi
Thanks for posting your Query on HCM
Melatonin supplements are synthetic forms of a naturally occurring hormone melatonin that helps to control the sleep-wake cycle.Taking appropriate doses of melatonin may help alleviate sleep problems.Depending on the reason for which melatonin is given, a dose of up to 10mg may be prescribed.In your case, 10mg may have been too much for you.Side effects of melatonin include:
drowsiness, stomach-upset, headache.These symptoms you presented and are enough to think of a probable overdose.
The feeling of being drunk after tilting your head may not be related to melatonin anymore.It could be another medical condition that interferes with equilibrium.With a normal ECG, heart related causes could be eliminated.Other causes may include: eye/sensory nerve/
inner ear disorders,Benign paroxystic positional vertigo, infection, meniere's disease,
orthostatic hypotension, medications, anxiety disorders, anemia,
hypoglycemia and so on
With all these possible causes, i will suggest you just stay calm, rest well and observe if it will happen again.If it repeats, you see a
Neurologist for evaluation.Simple blood tests like Blood pressure measurement, blood sugar test and full blood count may be needed for initial evaluation with detailed work-ups only if nothing found.
Hope my answer will help you
Best regards