Hi
I understand your concern.
Heart pounding, 
palpitation, 
rapid heart rate, sweating, tremor. all are the symptoms of anxiety.
If you have anxiety problem then may be it is exagerated anxiety that produce all symptoms.
You have to go for routine check up for heart.
2nd start medicines that helpful to reduce anxiety.
medicines
This condition can be treated  with mild dose of benzodiazapine  and mild dose of SSRI
in SSRI mild dose of escitalopram, 
sertraline and 
paroxetine like drug is very useful.
some natural ways to treat anxiety and daily stress are exercise ,meditation
deep breathing and hyperventilation
proper sleep and healthy diet.
Stress free activity,do pleasurable activity,music and hobbies
Discuss with friends
Confidence 
all this will help you to counter daily stress
If require then 
consult psychiatrist and get help.
Thank you.