As a former therapist (a long time ago) the technique called systematic desensitization comes to mind as helpful for treating phobias. It is basically slowly and gradually increasing exposure to the thing causing the phobia. Think baby steps such as imagining the thing until that becomes comfortable. Then advance to something a bit more risky. Increase the exposure as comfort and confidence is achieved. Do this in a safe, secure place with a trusted helper. You can take breaks and engage in something else as needed. It takes time to unlearn a phobia. It is also a good idea to replace the phobia with something that is positive, healthy, enjoyable and incompatible with the phobia. As you make progress reward the little victories along the way.