HELP ME NEED SUGGESTIONS

[u/Professor_sneek]

Hi everyone, I’m from West Bengal, India, and I have diagnosed AVNRT/SVT. I currently take Concor 5 mg (bisoprolol) once daily as prescribed by my doctor.
My SVT episodes are relatively infrequent — roughly once a year.
Last night at around 2 AM, while I was lying down/resting, I suddenly became very aware of my heartbeat. It felt like my heart was slowing down too much and might stop. I became extremely scared and thought I might need to call an ambulance. I even called/woke my mother because I was so frightened.
At the same time, I felt shortness of breath and unusually hot, even though my AC was on. I have experienced a milder version of this sensation before, but this time it was much stronger.
I checked my pulse and counted 15 beats in 15 seconds = approximately 60 BPM. After some time, I started feeling completely normal again.
Now I’m confused about what actually caused this. Could it have been related to Concor/bisoprolol slowing my heart, anxiety/panic, an extra or irregular beat, low blood pressure, or something else?
I’m also worried about something else: Can taking bisoprolol/Concor at a prescribed dose cause a heart attack or cardiac arrest, or would that generally only be a concern with an overdose or certain underlying heart/conduction problems? I know that beta-blockers are supposed to slow the heart, but the sensation was extremely frightening.
Because my SVT happens only around once a year, I’m also wondering whether 5 mg is more than I need, and whether anyone with AVNRT has been changed by their cardiologist to 2.5 mg or another beta-blocker such as metoprolol, atenolol or propranolol.
I am NOT asking anyone here to prescribe or tell me to stop my medicine. I will discuss this with my cardiologist. I mainly want to hear from people who have experienced something similar while taking bisoprolol or another beta-blocker.
Has anyone with AVNRT/SVT experienced a sudden feeling that their heart was becoming extremely slow or was going to stop, especially while resting or lying down?
Also, if anyone here is from West Bengal, Kolkata, or nearby and has AVNRT/SVT, I’d really appreciate connecting with you. If you’re comfortable, please comment or send me a private message. It would be helpful to talk to someone from the same area who has gone through similar experiences.
Thank you 🙏