<s>[INST] I have AF which has been treated successfully for 18months, over the last few weeks it has returned, many nights after dinner and a glass of wine. Tonight I skipped the wine but still went into AF. Could it be a reaction to some insect bites that I have been getting? [/INST] Hi Heath AF which returns after getting successfully treated once is known as PAROXYSMAL AF. AF is commonly associated with advanced age, hypertension, valvular heart disease, CAD, CCF, but it has no proven or documented relation with alcohol Chat Doctor.  So it cants be the reason in your case. But what you need to do now is to visit your cardiologist, get an ECG done to confirm, and you need to be started on ANTICOAGULANTS as AF is a risk factor for clot formation in heart chambers which can later lead to Stroke or other devastating complications. Good Luck </s>