Hello!
Thank you for asking on HCM!
Regarding your concern, your symptoms may be related to
anxiety.
You should know that it is a big psychological stress for the brain to wake up from sleep( which is total relax) to alert state, especially from an alarm clock. It causes an immediate increase of catecholamines in your blood, which induce sudden
tachycardia and even ectopic beats and
difficulty breathing. A phobia from the alarm clock (may be related to an event in the past), may cause such reaction.
But a
cardiac arrhythmia can't be excluded, especially when mentioning the lose of consciousness (it can happen during a
panic attack too).
I recommend consulting with your GP for a careful physical examination, a resting ECG, a chest x ray and some routine lab tests (
complete blood count, blood electrolytes, fasting
glucose, kidney and liver function tests).
An ambulatory 24 hour ECG monitoring may be necessary to exclude possible cardiac arrhythmia.
I would also advise to avoid the alarm clock, or to change its sound. You can use the radio for this purpose. If you don't have any symptoms when avoiding this stimuli (the alarm clock sound), it is probably just anxiety.
Hope to have been helpful!
Best wishes,
Dr. Iliri