What Causes High Pulse Rate And Heart Palpitations?

.Hello, I am a female 30 years old. At night and sometimes during the day my pulse has been 106 or higher. Last night I had a palpitation too. It's terrifying. At night I take benadryl, oxycodone (5/325) , aspirin, and cymbalta. Please tell me what to think about this. I'm afraid to sleep. Thank you very much.