Hello and hope you are doing well.
Awareness of your heartbeat is termed as palpitation and it can be due to hyperthyroidism( overactive thyroid), arrhythmias (altered electrical system of the heart), certain medications, heart failure, anemia and low blood sugar. It can be aggravated by exercise, fever, excessive alcohol consumption, smoking and dehydration. Anxiety, fear or stress can cause palpitations. You should consult your primary care physician for therapy. He will examine you and may ask for blood tests and an EKG.
Hope this helped and do keep us posted.
I only now have seen your post. Sorry about we overlooked and nobody was answering for you. All I can say you must visit your doctor. It is something that they want to do some test on. Do not worry, it is not something unusual. They will do some tests and that will give you a peace of mind and answers.