Welcome to the forum. Bottom line: you do not have genital herpes and shouldn't be at all worried about it.
Apparently you have read information that describes "tingling" as a symptom of herpes. If so, you misunderstood. Tingling alone is not a herpes symptom. Recurrent herpes blisters or sores may tingle, or tingling may precede a new blister/sore by a day or two. But that's all. Tingling does not precede the sores of an initial HSV infection. Further, the large majority of newly infected people have positive blood tests by 6 weeks (40 days), and your tests are entirely negative. To your specific questions:
1) Tingling generally does not precede initial herpes outbreaks. It may precede a recurrent outbreak by 1-2 days, not longer than that.
2,3) No. All negative results are equally negative. HSV blood test levels below the positive/negative cut-off are totally negative. (If the identical blood specimen were tested 10 times, it would give 10 different numerical values.)
4) IgM testing is totally valueless and the results, whether positive or negative, should be ignored. Here is a thread that explains this; although a few years old, the information remains accurate:
http://www.medhelp.org/posts/show/248394 The IgG test is positive by 6 weeks in around 80% of patients; it reaches maximum performance after 3-4 months. However, given all the information you provide, I probably would not have tested you for herpes to begin with and see no need for additional testing. However, if you remain concerned about it, have a final test at 3-4 months. Almost certainly it will remain negative.
"Genitally focused anxiety" is not a formal diagnosis -- it's entirely my personal description based on 30+ years in the STD business. However, just as forum users in whom I suggest that possibility generally don't return with long-term follow-up comments, STD clinic patients with such problems typically do not return to the clinic. I cannot say what happens to such persons' symptoms over time. I agree that this sort of problem generally seems more common in men than women, in my experience.
In any case, the bottom line is that whether anxiety or something else explains your symptoms, for sure it isn't herpes.
I hope you find this information helpful. Best wishes-- HHH, MD