When you say "clinical diagnosed", what do you mean? Were you visually diagnosed?
Yes, that's not all that reliable. What is reliable is your negative tests.
There are dozens and dozens of things that cause a rash in the genital area. You could have a fungal infection (of which there are many kinds), an allergic reaction, dermatitis (also several kinds), and many other things.
Antivirals don't work like you think they do. If you had a herpes outbreak, and took 2 valtrex, it would help the healing process. It doesn't relieve pain, stop symptoms, etc. I don't know if you took 2 at once, or two over the course of a day or two, but that's not even the correct dose, and it wouldn't have done a thing, probably.
So go to the doctor or an urgent care and get this looked at. Find out what it is.
And please, suicide is never an option. Even if this were herpes, there are definitely worse things that could happen.