I Have Had A Double Lead Pacemaker For 7yrs. For

I have had a double lead pacemaker for 7yrs. for bradycardia/tachycardia and am recently experiencing dizziness, weakness, stomach pains, am being treated for an active ulcer. Today I feel very disoriented, weak, shaky, sweaty and very hot and then very cold, I have no energy and head is clouded.