We need more information. Is the 115 now at 120-130 an at rest heart rate? Have you ever discussed with a doctor? I believe a rest HR of 115 and higher should be treated. A beta block is one common treatment.
Is there any irregularity, or is the HB just fast?
The shortness of breath may be due to Atrial Fibrillation or Flutter, which will reduce .the efficiency in bloo circulation. You need to get you condition checked by a doctor.
i have the same problem but i have irregular heartbeats my mom said i had heart murmurs when i was born the only reason why havent been to a doctor is due to the money that it cost.