When switching from analog cigarettes to electronic cigarettes it may be hard to discover what milligram nicotine is best for you. here is a list of symptoms of to much nicotine in the body. If experiencing these symptoms try a lower milligram of nicotine. A lot of people give up on electronic cigarettes if they experience these symptoms because they are not sure what it is. Hopefully with the symptoms listed you can adjust your nicotine and find something that works for you. symptoms of nicotine overdose Extreme anxiety Depression Excessive sweating including sweaty palms and feet Insomnia to the point of delusion Panic attacks Increased blood pressure and high pulse rates Heart palpitations Dizziness Tingling feelings in her back and head Diarrhea IF YOU EXPERIENCE THESE SYMPTOMS cut back on vaping or nicotine levels.