Hi. I am sorry to hear that you are experiencing symptoms again. I would suggest that you meet your psychiatrist again to get evaluated. Doubts are not necessarily delusions. Doubts can be a very integral part of OCD. In fact, doubts are one of the most common obsessions seen in OCD. Since, with medications you had a good response last time, it would be beneficial to restart it again after consulting your psychiatrist. In addition, psychological intervention in form of behavior therapy will help in much better and long lasting response.
Next Steps
Meet your psychiatrist without any further delay.
Health Tips
Try a combination of medications with behaviour therapy for better response.