Im sorry to hear about your symptoms. Well usually acyclovir is prescribed for 10 days at the most, in a majority of the patients. Unless you have had regular recurrences in the past, for which acyclovir can be used for upto 12 months at a time, there isnt a need to use acyclovir. But as i said if you have had several recurrences then acyclovir would need to be continued. Secondly acyclovir doesnt really take care of the pain, it would reduce the appearance of blisters in the genital region or when they do develop would reduce the time it would take for them to resolve and indirectly treat the pain (from the blisters). But if you have developed pain which is severe in the region without any blisters for example, it would be wise to rule out neuralgia which is damage to the nerves. This would need to be treated with drugs like pregabelin etc.
As far as appearance of blisters while being on acyclovir is concerned, it is possible that the virus has acquired a resistance to the drug and if this is the case then you would need to be started on drugs like foscarnet. It is likely that yyou may have developed a resistance to acyclovir and that is why the blisters are reappearing. In some cases ypou may be started on drugs like valacyclovir or gancilcovir as well to counter this appearance.
Since you mentioned that there are NO blisters then you could have likely developed neuralgia which i mentioned previously. this would need treatment with drugs like lyrica or neurontin. This can happen after many herpes infections. Your best bet would be to see your doctor for an examination and get a prescription for lyrica which should solve the problem.
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