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White areas inside the vagina that are painful when urinating sound most like genital herpes. I would recommend that you see your doctor for a herpes culture to know.
In the meantime, sitting in warm water with epsom salts would be both soothing and healing.
If it is herpes, there are pills that can help it to resolve sooner.
Herpes can appear within 48 hours of having sex. They can appear either inside or outside the vagina.
Usually genital herpes will be small white or red ulcerations. They are usually not streaks, so maybe it's something else.
Your doctor will be able to tell better by looking at them. But a culture may be needed to be sure one way or the other.
Here is one picture of genital herpes http://img.medscape.com/slide/migrated/editorial/cmecircle/2002/1990/richwald/slide13.gif
It's slightly possible that it could be caused by abrasions, but that seems much less likely.
Not raised is usual for herpes. Herpes may be circular or elongated.
The main symptoms are ulcers that are painful on urination.
It's treated with warm baths using epsom salts, plus anti herpes pills.
You can send a picture using the paper clip.
It looks like it could be herpes, but it's hard to tell from a picture. If a doctor looks at it, he/she will be able to tell better.
Have the white areas disappeared?
I think it means that it's not herpes. It probably also means that it's nothing serious. Perhaps it was just a local reaction to something. But since it's totally gone now, I would think you can forget it.