thank you for your query.
The fluttering you describe could be a side effect of Champix
, and also a side effect of smoking withdrawal.
It could be caused by benign muscular spasms in the area.
also could cause similar discomfort.
The heart problems you describe sounds like palpitations or ectopic beats.
Unfortunately, the nature of the complaints is too vague, and you need proper evaluation by your Physician along with necessary tests to pinpoint a cause.
Please consult your primary care
physician for detailed diagnosis.