Welcome to the STD forum.
My initial reaction was to the wording of your question, before reading anything else. It is commonly believed that herpes frequently causes "atypical" symptoms. Actually, it rarely does so. When herpes causes symptoms at all, mostly they are quite typical, just mild. Therefore, when someone asks whether their as yet undiagnosed symptoms are due to herpes, usually the answer is no.
In reading the body of your question, my initial reaction holds up well. The answer to the closing question is no: your symptoms do not sound like genital herpes. An initial "pink spot" on the penis doesn't suggest herpes, especially starting 2 weeks after exposure (3-5 days is usual). Your doctor is correct that herpes lesions usually are blister-like. Herpes certainly does not cause "tingling in groin usually in the upper inner thigh". Also, your "almost always" comment is strong evidence against it; herpes outbreaks never last more than 10-14 days, never recur more often than every 4-6 weeks, and between outbreaks there are no symptoms at all. There are few or no exceptions to this pattern.
Finally, the blood tests are highly accurate -- regardless of country. There are only a couple of test methods that exist, and they are the same everywhere.
As to " What could be causing...[these] symptoms besides genital herpes?", I really cannot help. On this forum we generally try to avoid speculating about non STD explanations, and clearly it is no STD -- or anything else that comes from the sexual encounter last year. If your primary care physician can't give a clear answer, you should consider seeing a dermatologist. But you can put all concerns about herpes or STDs aside.
Best wishes-- HHH, MD
A dermatologist should be able to tell you what it is -- but even if not, please let the herpes idea go.