Loud heart beat after exertion.

Greeetings, I am Male 27. I had typhoid in December-January 2018, its been 3 months after that. No medications are going on. I feel harder heart beat after smaller exertion. But heartbeat is regular. I was in anxiety attacks that time, so was misunderstanding with heart attacks. My doctor told me I am OK but still for my conformation I should do ECG. And I did same. ECG was normal. I haven't taken any anxiety medication, I managed it with meditation and EFT. But still I get kind of harder hart beats after exertion like if I climb 2 or more floors via stairs etc. Another thing is I was regular in exercise but after tyohoid my daily routine has changed completely, I am doing desk job right now so don't even walk 2000 steps per day. Can it be a reason for that. Another thing is My company doctor had my medical checkup, he told me my blood pressure is only 5mm lower than high limit so need to take precautions.