I am so glad you are reaching out for help. I am not a psychiatrist, and do not wish to question one. The information I give is of a general nature and is in no way to be construed as a diagnosis.
OCD is in reality a symptom or form of anxiety. Based on the information I see here, I would assume your son is suffering from anxiety due to the life change. I would think you need to consider a change in medication, either dosage or prescription in general. I believe you need to schedule another assessment and get a second opinion.
Does that make sense toy you? Let me know if you have questions or concerns.