Depending on the duration of the symptoms you have the reason you have these experiences can be various conditions. You can benefit and perhaps become symptom free by the use of medicines.
Next Steps
Consult a psychiatrist at your convenience and followup regularly to get proper diagnosis, such that you get the appropriate treatment for your condition.
Health Tips
You are not alone, just look up the internet and you will find great and world famous personalities who have battled fear and anxieties like the one you are battling with right now. The Great thing about it is, they have all won over their anxieties and succeeded.