Facts : June-Aug 17, 2014(possible last exposure..could be before), my  girlfriend cheated on me with a guy she worked with. They had sex at least 10 times. A couple of times without a condom. Guy is white 20-25, high school educated, has sex with women although had admitted that he has once had sex with a guy in the past. Going through his facebook, he looks like an average educated guy with good friends and family around.
I then went on to be in a year and a half relationship with her. She is now my ex.

To jog my memory back to 2014, After I found out about this, I did not let her back in until she got tested. She got STD screening in between  3 to 4 weeks  (24 days) (from the last possible day they could've had sex) at my university's student health testing center. Everything came out negative.  We went about with our lives.After 34-40 days she had ARS like symptoms (fever, cough, sore throat, stuffy nose) but I never realized these could be related.
2.5 years from then, I am now worried I may have HIV.  
 I hadn't thought about this  and it randomly came to me last week and I am worried out of my life. All I think about is this.  I have been trying to message this guy and looking at his profile on facebook all day because I am so scared while neither of them look any bit concerned. I have been reading how HIV tests are not accurate at 3 to 4 weeks. And how ARS can happen after 5 weeks!

Welcome to the forum. Thanks for your question. FYI (and for others who may be thinking of posting questions), it is only by chance I am replying and not Dr. Hook. We take questions randomly without regard to requests for one or the other. Our styles are different but our knowledge and advice never are.---

Thanks for your time DR. HHH. My mother is an infectious disease doctor herself. I'm just so traumatized that i see statistics of number of infections per year in the USA, and number of people not knowing.   I did not even think about it for 2 years as I assumed the test she did would be conclusive.   I read something you wrote that ARS symptoms occur almost always within 10 to 20 days. Her symptoms were around 40 days .. 
Almost randomly-- last week as I started tracing back my memory lane, I am randomly starting to ask a lot of "what if's" and thinking of the worst case.  Some research on statistics  and I find myself  mentally depressed.  A year later---I have a genital wart and I am constantly checking for more symptoms all around my body and any change.  There are so many friends in college who never think about such a possibility. They have much more casual sex (on birth control)- but I have panic attacks over it.    
When my ex was on birth control and she didn't get her period exactly on the day, I would start hyperventilating with situations in my head.  I know you've said to go test-- but based on the information I provided, am I overreacting ? ?  I don't recall myself getting any extreme fevers or sore throats or rashes through my 1.5 years with her. 
I don't want to annoy you but I am so so worried that I'm having the fear of testing.
Please advise

Are you "overreacting"? Yes indeed. But that doesn't mean you shouldn't be tested. Almost certainly my reassuring words won't be enough:  probably you're going to continue to worry about this until you know for sure you aren't infected. Anyway, CDC recommends that everybody age 13-64 be tested for HIV at least once, regardless of known risks. This is obviously a good time, when it's on your mind. As for fear of testing, I have no patience for such irrational nonsense -- and I'm sure you understand that's what it is. It isn't the test that gives someone HIV. You have it or you don't, and if you do, of course you have a responsibility -- to yourself, your potential sex partners, and your family -- to know. And research shows that when someone delays HIV testing (or any other medical screening procedures, e.g. women contemplating mammograms), anxiety and stress always decline after testing, even if the test is positive for whatever dreaded disease is at hand. The stress of worrying about it always is worse than having the answer, even if it's the answer you fear. Suck it up and just do it.---

Thanks a ton, doc. Got rapid tested and within 5 mins they said I was negative. I appreciate your advise. 

I'm very glad to hear you were tested. I'm glad to have helped. Best wishes and stay safe.---