Hi Janmaran, just a quick thought - have you looked into hypoglycaemia as a possible cause of your racing heart & dizziness episodes? Low blood sugar becomes more common at menopause & can cause some very unpleasant symptoms, including racing heart, panic & dizziness as shown in the extract from the link below:-
https://emedicine.medscape.com/article/122122-overview"Neurogenic or neuroglycopenic symptoms of hypoglycemia may be categorized as follows:
Neurogenic (adrenergic) (sympathoadrenal activation) symptoms: Sweating, shakiness,
tachycardia, anxiety, and a sensation of hunger
Neuroglycopenic symptoms: Weakness, tiredness, or
dizziness; inappropriate behavior (sometimes mistaken for inebriation), difficulty with concentration; confusion; blurred vision . . ."
There are many threads dealing with hypoglycaemia if you search on it or "low blood sugar".
The key to managing it is to eat moderate sized meals rather than large & don't go many hours between - healthy snacks help if you are on the go. Choose complex rather than simple carbs (avoid white flour products, white rice, sugar etc), have adequate protein at each meal, together with varied sources of fibre, both of which help slow digestion, reducing the sugar spikes & troughs that give rise to symptoms. It's important never to exercise on empty either! There is more to it than that but I'm out of time this morning & there's plenty been written about it on the forum if you think this might be relevant for you.
Another thought is that supplementary magnesium can reduce blood sugar, so depending on how much taken, may not help any hypoglycaemic tendencies.
I hope you manage to get to the bottom of it & will soon feel very much better.
Wx