All cases are possible with S{S|N}RIs (I am a doctor but I know a little regexp). Patients that took them for two months and never needed again and others that cannot stop them after 20y. The start, the stop and every restart of the drug needs an indication so it should be approached with the same care as any medical decision.
It's not right to call it withdrawal. These drugs are not addictive like benzos or alcohol are. If any symptom reappears it's just that the mental disease most usually changed form after so long time. As for the sexual dysfunction, a common known side effect is that they kill (delay or eliminate) the orgasm. Libido and male erection are affected by so many psycho-social, somatic and genetic factors that it's usually difficult to spot the exact relation with these drugs.
It's not right to call it withdrawal. These drugs are not addictive like benzos or alcohol are. If any symptom reappears it's just that the mental disease most usually changed form after so long time. As for the sexual dysfunction, a common known side effect is that they kill (delay or eliminate) the orgasm. Libido and male erection are affected by so many psycho-social, somatic and genetic factors that it's usually difficult to spot the exact relation with these drugs.