Intra-urethral yeast or fungal infections are rare and I doubt your urethral feelings have anything to do with the penile rash. However, this might be possible if the rash itself is on the tip and involves the urethral opening. Most important, whatever it is, it's nothing serious. Considering the antibiotics you received, this isn't anything that will ever harm your health or that of a sex partner. Perhaps knowing that will help the symptom improve, especially if anxiety about it is contributing to the sense of discomfort.
The terminology can be confusing, made even more so by the shorthand used by some physicians.
As you may know, fungi are large group of organisms. Yeasts are a particular group of fungi. Yeasts (and other fungi) include those that do and do not cause human infections. Yeasts -- mostly Candida albicans and other Candida species -- are the most common cause of genital fungal infections, especially in women. So many providers have the habit of calling all genital infections "yeast". However, on dry skin non-yeast fungi probably are more common. The most frequent of these are the same fungi that cause athlete's foot, or closely related to them.
It is rare to do tests for the specific diagnosis for yeast or other skin fungal infections. In general, a visual diagnosis is accurate enough to prescribe appropriate therapy. Anyway, testing isn't all that easy, with expensive tests whose results usually don't make any difference in management. In most cases an over-the-counter cream like Lamisil and others is effective. In other word's, your doctor's diagnosis and advice sound entirely appropriate, just what I would have done. But you could clarify with her whether she really means yeast or other fungi-- although it probably doesn't much matter.
As for your "tingling, annoying sensation", this may not be due to the same thing. Neither yeasts nor other fungi are likely to cause such a thing in the absence of an obvious, easily visible rash. If these are your only symptoms, I would not expect any anti-fungal or anti-yeast treatment to make any difference.
Finally, this might not be a yeast or fungal infection at all. Most of the hundreds of kinds of skin rash sometimes affect the penis. If antifungal treatment isn't helping, or if the tingling etc continue in the absence of rash, then your next step probably should be to see a dermagolotist for a second opinion.
Welcome to the STD forum.
From your description, this doesn't sound like herpes or any other STD. Herpes simply doesn't behave or look the way you describe and my guess is that it has nothing to do with your recent sexual encounter; more likely a localized fungal infection or other irritation. Even though the HSV blood test is not perfect, as you note, the combination of non-herpes symptoms plus the negagtive test make it certain that something else is the explanation.
1) You don't need any further testing for herpes. If your own physician is unable to give you a definitive diagnosis for the problem, I suggest seeing a dermatologist.
2) Every blood test for antibodies to an infection has differences from others in the biology, chemistry, and technology of the test. There is no particular reason that it happens to take longer for HSV than HIV.
I hope this helps. Best wishes-- HHH, MD
Thank you doctor, it does help. I assume constantly reassuring people gets old, but it really is appreciated.
The tingling sensation feels like it is inside the tip of my penis, which I don't know if I made very clear. The rash occurs on the tip of my penis when it is visable, but when there is no rash, I still feel a tingling sensation inside of my penis, still located towards the tip, if that makes sense. Could I have yeast or another fungus inside the tip of my penis?
Thank you doctor. When I first went in, it was to a ready care and the doctor who looked at it said it could be a yeast infection, but she did not test for it. Are there other fungal infections that aren't yeast infections? And how would I go about getting tested for it? From what I understand, they rarely test or treat men for this and my rash doesn't stay very long, but the tingling, annoying sensation remains and is becoming fairly annoying. Thank you for all of your help, again.