Hello and thank you for your question,
It is very unlikely for your blisters to be anything else other then herpes. Although herpes are usually painful, they dont always have to be. There are really no other infections which will produce symptoms similar to what you have described.
To know for sure, it would be best to see your doctor as soon as possible while you still have a blister (before it scabs) so that a culture can be taken. Culture will confirm the kind of infection you have.
If indeed you had herpes, your symptoms may come back frequently or not again for several years, there is absolutely no way of predicting. However, if herpes is confirmed, you should have anti-viral medications on hand in case of future break outs.
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,