Addiction is different than just withdrawal symptoms. Yes, anti-depressants have withdrawal symptoms. This is why it is recommended that one gradually reduce one's dosage rather than quiting cold turkey. Has people went off and mistook the withdrawal symptoms as the original problem? Probably. I can't remember the name of the book but there is a book on anti-depressant withdrawal. Paxil CR is one of the worst. Prozax is one of the least that causes withdrawal symptoms due to the fact that Prozac stays in the blood for a long time. I went off Lexapro for two days and was dizzy which was one of the withdrawal symptoms. If you were suffering from withdrawal symptoms, the "depression symptoms" would go away immediately after re-starting the drug. I suspect if it is depression or anxiety the symptoms would come on later and take longer to get rid of the symptoms when you re-start the drug. I do not know how much time from discontinued use the withdrawal symptoms would start because that depends on how long it takes for the drug to leave your system. I looked up Lexapro in the book and it said three to six days is when withdrawal symptoms most oftenly take place. I'd suggest that you ask your doctor and try to find a good book on the subject. I think the book was by the auther of Prozac Backlash and was much newer book. I would compare the information with your doctor to see if that is his experience too. I am not sure if this auther is honest or a scare monger. My former drug has withdrawal symptoms of flu-like symptoms and dizzyness according to my Pdoc. Most SSRI's probably have similar withdrawal symptoms.
Since I am not on an anti-psychotic, I have not looked into any of that. I hate that my brain is dependent somewhat on an anti-depressant.

Addiction crieteria: three or more of the following
tolerance: you need more and more of the drug to get the same effect
Withdrawal: (I have this.)
Substance is taken in larger amounts or for a longer period of time than planned for (loss of control drug use)
Attempt to quit repeatedly or persistent desire to do so
pre-occupation with getting the drug, using the drug or recovery from period of use
reduction in activities or giving up of activities due to drug use
continued use despite medical problems or psychological problems caused by or exacberated by the drug use (knowingly)
This is my own paraphrase so don't take it as gospel or anything. I can see an anti-depressant being true for tolerance and withdrawal but I don't see much for the others but the book that I mentioned made a case using a person who tried to go off Paxil CR cold turkey and ended up begging for the drug because of the withdrawal symptoms.

I am not a doctor, counselor or professional in this area. I'm am just a mental health user who likes to research my drugs.