Thank you for reaching out to us. We appreciate your anxiety about suddenly becoming niddah.
You can take precautions to avoid finding problematic staining on the dilator. When you are tehorah, you should remove the dilator without looking at it and immediately wash it off without looking. It may be easiest to accomplish this in a darkened room.
During the shivah neki’im, you should perform your bedikah before using the dilator. When you perform a bedikah beforehand, it is permissible to avoid looking at the dilator, as above, even during shivah neki’im.
We hope that being careful with these precautions will enable you to begin treatment with confidence. For your sake and for your marriage’s sake, you deserve to be pain-free and have a pleasurable sex life.
Please don’t hesitate to get back to us with any further questions.
We wish you a successful treatment and a refuah shleimah!