Thank you for asking HCM
I have gone through your query.The symptoms like palpitation chest discomfort
and tingling in left arm could be due to your hypothyroidism
.As your ECG is safe then no need to worry but hypothyroid should be corrected with thyroxine
with regular follow up.Serum cholesterol
should also be checked, and if high, a low dose statin should be taken also.Your doctor has given impression on your routine blood that you might have a viral infection.By seeing lymphocytic leucocytosis he should have given that impression.It should be correlated with your actual clinical findings.It could be a respiratory viral infection also.But if it is a mild increase then no need to worry.Hope this may help you.
Let me know if you have any further query.