Hello @marianne103, Welcome to Connect. I think it may depend on your medical history and other symptoms. Mayo Clinic has some information on Tachycardia including when to see a doctor here - https://www.mayoclinic.org/diseases-conditions/tachycardia/symptoms-causes/syc-20355127.

I see from another post you made that you are waiting for a call back from your cardiologist. This is from the Mayo Clinic information above:
"Seek immediate medical help if you have:
- Chest pain or discomfort, Shortness of breath, Weakness, Dizziness or lightheadedness, Fainting or near fainting."

It's been 4 hours since you posted so hopefully you aren't having any of the symptoms that require immediate attention.