Its hard to diagnose you without a face to face evaluation, but given how your worries and anxiety jumps from topic to topic in a rapid manner (e.g. hurting your family, STD, etc...) it sound like this is more of a Generalized Anxiety Disorder (GAD) rather than OCD because OCD is usually on one specific topic and lasts a lot longer than just a week. A SSRI antidepressant in combination with the Xanax would be wise because you do not want to rely too much on the Xanax as it is a physically addictive substance and the SSRI antidepressant is very good at lessening anxiety and worry. CBT should still be considered as a long-term treatment plan to treat the core causes of your anxiety. CBT has a premise that your symptoms are caused by negative thoughts, so if we change your thought process to be more positive and objective, then your symptoms will lessen as well. Here are a few good links on CBT to help you to think more objectively and not focus on the negative, so that you can gain more control of your thoughts and lessen your anxiety.
So this link may help you, it contains a technique I use with patients called a thought record. It will help you keep track of any negative thoughts you have. You put the negative thought on paper, the emotion accompanying, the evidence to support it, and the evidence against it. Then I want you to come up with an alternative thought for the situation (more objective and plausible). This will help you change your way of thinking to be able to think more positive and not automatically go to a negative type of thinking.
In addition, these two worksheets are very good at helping to lessen negative type thinking. It can help you focus on the big picture and the objective/positive thoughts and outcomes.
Please let me know if you have any further questions or concerns as I am happy to assist you.