How quickly does acyclovir work?

[wwill]

I recently had unprotected vaginal and oral sex with a friend.  The next day she told me she had herpies.  I was floored and overcome with worry.  She told me not to worry and that it wasn't a big deal!  I couldn't believe her response.  Ten days after the encounter, two small red bumps appeared on the shaft of my penis.  I went to the dr the following day and he gave me a blood, urine, and culture test.  I am still waiting for the results.  He also prescribed acyclovir for ten days.  I took the first pill right before I went to sleep.  When I woke up, I checked the progress of the two bumps and they were almost gone. Two days have passed and theyre entirely gone.

My question is this:
Is it possible for acyclovir to work that quickly?
Any info would be greatly appreciated
I am extremely worried that I have herpes

[wwill]

The results of my second culture test came back negative.   I told my doctor I was still having mild pressure and pain in my penis.  He told me its all in my head and I'm stressing myself out.  Eventhouh i thought that hearing  a negative result would calm me down, I'm still feeling this real pain as it has occurred  on and off for the past couple weeks.  Because I didn't have a blister or open sore, I feel the results are not accurate.  

Am I justified in thinking that despite the doctor saying both tests were accurate?

Is my constant pain a sign of herpes?
I'm so ready to put this behind me as it is truly affecting every aspect of my life

[gracefromHHP]

just because it's never been a problem before doesn't mean that your penis isn't more sensitive as of late and you are just further irritating him by not treating him kindly.  

[wwill]

That's why I'm so concerned because for so many years it's never been a problem I feel doomed.

[gracefromHHP]

use a good lube when you masturbate dear! You have to be kind to the little guy - not irritate him by rubbing your hand over him dry!

[wwill]

The dr also prescribed another round of acyclovir but I didn't take it.  As a previous post mentioned I shouldn't take the medication until I know for sure.  Is that the right course of action at this time?

[wwill]

No lube was used
Thanks again for your quick response!
I'm so stressed