Stress has many adverse effects on the heart and the body in general. It will increase the levels of adrenalin in the body which increase the BP and also the heart rate. There are also effects to raise the levels of cholsterol which can then exert an adverse effect on the blood vessels.
You likely need to see an electrophysiologist and you may need to have an ablation.
The symptoms may be related to your heart and clearly this needs to be evaluated to determine the cause of the symptoms.