Thank you very much for the answer. I have been stressed at work and home over the last couple of months and have also had a cold and cough over the Christmas break which of course did make me a little breathless when doing anything physical which I think also added to the stress. I am going to take part in an Oxford University medical research study and they will be taking all my vital signs and possibly an ECG before I commence the programme so hopefully that will help with my concerns.
Thank you for the reply. The ECG did come back ok but I have made an appointment to see my GP for peace of mind.