I had something similar and I visited a therapist who helped me see that I had created a narrative about certain locations, that they were making me anxious. I had to challenge this mildly delusional thinking while managing the anxiety using recommended practices from ACT therapy. Its almost like I needed permission to disregard certain thoughts as nonsense/narrative and also learn to struggle and fight less against uncomfortable feelings. Doing this ultimately makes them lose their power. If you were truly traumatized by previous computer use then a more appropriate strategy might be needed to combat the PTSD-like responses. Either way, I recommend seeing a professional.