You have described features suggestive of Obsessive compulsive disorder with predominant theme of contamination and engaging in cleaning compulsions. I can understand the distress (to yourself and the family) and associated dysfunction. May I suggest the following:
Please get your Bl thyroid profile tested.
Be regular in your follow-ups with the Psychiatrist.
SSRI (serotonin specific re-uptake inhibitors) are known to help. There are different medications within this group. If one doesn't show a good effect, the other needs to be tried but surely underthe guidance of a Psychiatrist and not by yourself. Medications do take a while to bring about an appreciable effect. You have tried Fluoxetine 60 mg/day, which ius also an SSRI. But one needs to be sure about issues of adequate/optimum dosage, compliance, regularity of taking medication before deciding on another SSRI. At times psychiatrists also combine SSRI with clomipramine and other psychotropic medication (monitoring for tolerability) to help their patients from obsessive symptoms. And please do not stop these medicines abruptly, without proper consultation.
Cognitive behaviour therapy; graded exposure and response prevention also help and are used in addition to medication for good results.
I suggest a detailed psychiatric consultation and regular reviews with the psychiatrist.