How to deal with life after cancer?

Hello first time posting here. In July of 2023 my wife was diagnosed with stage 4 melanoma. She was 24 weeks pregnant at the time. She delivered our baby at 26 weeks and started treatment. Fast forward to today after countless hospital visits, scans, icu admissions and countless other issues she is in remission. Through this whole journey she has been very optimistic and has stayed positive. Our daughter has been doing great she faces challenges as she was born so early but overall she is doing good. My concern comes from the way I have been feeling. I find myself being super short and often times get annoyed very easily. This journey has changed me as a person. I worry a lot about the future and the possibilities of what it holds. I guess my question is, is it normal to feel like this? I’ve been seeing a therapist but I don’t know how much it actually helps.