if you have a prescription from your provider, you can get a round of acyclovir for $4 at walmart to treat ob's when they occur. If it's been more than 72 hours though since your recurrence started, not much bang from your buck to be had from antivirals at this point.
you can try something as simple as soaking in the bathtub with epsom salts thrown in for comfort. dermoplast spray ( the blue can for the genital area, not the red can ), is also helpful for pain relief.