Hello...
Sounds like you have had a tough time with all of this. I want to mention, that unless you were given an event monitor along with the Tambocor, I would not take it untill you speak to your Dr. Antiarrhythmic medication are not to be taken like any other meds. When people therapy with these is being initiated, standard practice is that a recording needs to be sent in from an event monitor 2 hours after each dose.
These drugs can sometimes prolong the QT interval as well as kick up other rhythm disturbances. If this is treatment for PVC's this medication is a last resort treatment. Usually not given until all other medications have failed to treat you symptoms.
That being said, I certainly can't tell you what to do or what is best for you. I can only advice you to speak to your cardiologist, not his nurse, or speak to your primary care Dr. It really concerns me that this drug wass tossed to you like it were an antacid.
If you need further info, just drop me a line:)
Im sorry i should have added that i take atenolol 50 mg and levoxyl 100mcg once a day