Why do I always feel nervous? When I gave birth before, the doctor couldn't measure my heart rate and took my pulse and told me that my pulse beat twice a beat. So please help me doctor.

In 2019, I suddenly appeared symptoms such as nervousness, heart palpitations, shortness of breath, fatigue... sometimes I had to take a long breath to make it easier to breathe. Initially, that symptom appeared from time to time, but later it appeared more and more often and more often.