I'm not telling you to resist your OCD or your intrusive thoughts. In fact let these thoughts come to you. Then do nothing to ease your anxiety. Resist your compulsions. It is an important step to learn to live with the uncertainty. Because compulsions only ease your anxiety for a short period of time. Compulsions only feed your OCD. When intrusive thoughts come to your mind, just accept their existence (i'm not telling you to accept that they are real because they are not) just recognize them amd observe them without engaging them. Try not to perform your mental compulsions like reassurance seeking, ruminating or replaying past events or memories to find any "evidence" or physical compulsions if you have any. Let the thoughts stay there and do nothing to get rid of them. It is hard but you can do it. Despite the anxiety, try to continue your daily activities without engaging the thoughts. It is a painful process but with persistence and practice, it gets easier. OCD, is as powerful as the importance and attention we give to the intrusive thoughts. If you give them too much attention it only gets stronger and more uncomfortable. The key is to be able to tolerate uncertainty and to be able to live with the doubt.