Exams retake?

Hello everyone,
I've done a summer semester in Poland but didn't pass 2 exams as I was not feeling well mentally (a small depression) for 2 weeks. Even typing my situation rn is making me shaky as I'm not comfortable dealing with stressful situations and tend to bury my head in the sand to avoid facing the reality (I tried working with a psychologist on that but i still struggle). Also, can I still change a course in my OLA which wasn't added in time? (it means communicating with the professor in question but even that makes me scared)