Since Yesterday, Continuing Through This Morning When I Do Slight

Since yesterday, continuing through this morning when I do slight physical exertion - carrying 4 fold up chairs at a time or carrying a single 6- fold up table 30 yards, and last night walking home 5 blocks I am experiencing a light head , a tightening of the chest and feeling of sever exhaustion. I am a building contractor and am used to physical labor, so this has been a first time experiencing this. I am now 64 years old. Those symptoms go away when I am at rest. Should I go to my physician?