According to the symptoms you report (“pins and needles in my head”, “electric like blood surge around my body”, “feeling of falling”…) you might be experiencing some type of anxiety disorder such as somatoform disorder.
One of the reasons for irregular cycles could be that you are experiencing perimenopause. During perimenopause , menstrual cycles become longer and menstruations rarer. Perimenopause can also contribute to the development of anxiety disorders including panic attacks or somatoform disorder.
It seems, however, that you are probably still too young to be experiencing peri-menopause (in your early 40's) so it seems that the current anxiety disorder has nothing with menopause. Persistence of a chronic organic disease (coronary heart disease in your case) can also contribute to the development of anxiety disorder. For treatment alternatives, you can seek the opinion of your GP or a mental health professional.
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