It has been suggested that patients with myocardial infarction and non-obstructive coronary arteries (MINOCA) have more psycho-emotional disorders than patients with obstructive coronary artery disease (MICAD). The aim of this study is to compare the prevalence of anxiety, insomnia, and type D personality between MINOCA and MICAD and their impact on prognosis. Patients with myocardial infarction undergoing coronary angiography were prospectively enrolled. Psychological questionnaires were completed by each patient during admission. Among a total of 533 patients, 56 had MINOCA and 477 had MICAD. There were no differences in the prevalence of anxiety and insomnia between both groups: trait anxiety median value (M) MINOCA = 18 (11-34) vs. MICAD M = 19 (12-27), p = 0.8; state anxiety MINOCA M = 19 (11-29) vs. MICAD M = 19 (12.2-26), p = 0.6; and insomnia MINOCA M = 7 (3-11) vs. MICAD M = 7 (3-12), p = 0.95. More MINOCA patients had type D personality (45.0% vs. 28.5%, p = 0.03). At 3-year follow-up, there were no differences in mortality between MINOCA and MICAD (hazard ratio HR 0.78, 95% confidence interval CI 0.28-2.17) in major adverse cerebral or cardiovascular events (MACCE) (HR 0.71, 95% CI 0.38-1.31). Scores of trait anxiety and negative affectivity were significantly associated with MACCE (HR 1.65, 95% CI 1.05-2.57; HR 1.75, 95% CI 1.11-2.77, respectively). High insomnia levels were associated with greater mortality (HR 2.72, 95% CI 1.12-6.61). Anxiety and insomnia levels were similar between patients with MINOCA and those with MICAD, whilst the prevalence of type D personality was higher in the MINOCA than in the MICAD group. Higher scores in trait anxiety, insomnia, and negative affectivity were related to a worse prognosis at 3-year follow-up.