Are you saying that you were diagnosed via a blood antibody test? It would be useful for me to evaluate that test result to help you more accurately. No, herpes does not happen every day in anyone I have ever seen as a patient. I suppose you could be the first exception but it seems unlikely. But if you have no symptoms when you take the medicine, then none of this makes much sense. So I am going to answer your question as though these symptoms are herpes, though they too are quite atypical.
It is safe to take the medicine continually, and indefinitely with information we have gather over the past 30 years. I am assuming you are taking this higher does because you did not do well on 400 mg twice a day?
If you were may patient, I would suggest that you do swabs of your genital area when you have these symptoms to see if they are really caused by herpes.
Do you know that you husband is uninfected because he has had blood tests to determine that he is not infected? You could do artificial insemination if he is very concerned about contracting herpes from you.