I've recently been diagnosed with OCD, despite having no previous mental health issues in the past. My intrusive thoughts are somewhat dark and cause a great deal of anxiety, and often feelings of depression/ hopelessness. After countless research and support from my mum I was able to book a session with a cognitive behavioural therapist (only the one session as therapy is far too expensive). He explained that everyone has intrusive thoughts, but are able to dismiss them or shrug them off. Why is it that my intrusive thoughts stick, and despite countless self help techniques and 'natural' medications such as cbd and St. John's wort, do they persist and cause aggressive anxiety and feelings of doubt. I understand it takes time for medication to work, and to master self help techniques, but why is it that these intrusive thoughts stick and don't go away?