 In this study, the investigators aim to examine a novel therapeutic approach for the treatment of affective instability in PMDD: brain-guided training i.e.NeuroFeedBack, NF probed by prefrontal EEG alpha asymmetry. PMDD patients will be randomly assigned to either a real or sham EEG-NF protocol, and undergo simultaneous fMRI-EEG scans before and after training period. Comprehensive psychological assessment will be performed for outcome measure. The investigators hypothesize that EEG-NF treatment will enhance affective stability, thus improving patients daily lives. 