A detailed history evaluation of the thought content and past history is mandatory. Given the history of getting diagnosed with OCD, and it being a very stubborn disorder to recover from, there could be various reasons of recurrence. Also OCD can be comprise with multiple other psychiatric disorders especially depression. Sometimes overt symptoms of either disorder may mask the severity of other.
Next Steps
Consult a psychiatrist, if you have improved on certain medications previously prescribed, likely you will respond on the same. Some Augmentation may be needed but a psychiatrist will be able to guide you through it. Various newer treatment modalities are also available and have proven to be effective. Drugs like vortioxetine, ketamine therapy, neuro modulation etc.
Health Tips
Various psychotherapy especially behavioural therapy are noted to be effective in OCD.