You have been already suggested that you had no risk for HIV contraction from oral sex and do need an HIV test for this incident.
Since this forum is specific to HIV prevention only, I would suggest you to start a thread in the STI forum to get your questions answered. Although most of your concerns are already addressed here by auntiejessi.
So first, breathe.
There is no risk for HIV from oral sex. Even if there was (and there isn't), your test was negative. It's conclusive.
Urgent care docs are great for sprains, strep throat, etc., but not for STDs, which are not generally "urgent", so aren't their area of specialty.
Your symptoms aren't actually symptoms of HIV. They could be symptoms of other illnesses you get as a result of having a compromised immune system, which doesn't actually happen until later on in untreated HIV - none of this would apply to you. You don't have HIV, it wouldn't be a long-term infection if you did, and your immune system is fine.
Those are all actually symptoms of anxiety, as well as many other things, including reading too much stuff on the internet.
You mention no genital symptoms of anything - no sores, no burning, no discharge. This is good news.
From getting oral sex, you could be at risk for gonorrhea, NGU, syphilis and genital herpes type 1. (If you already have herpes type 1 (think cold sores) you can't get it again genitally.
Since it's been at least 90 days, you probably don't have syphilis, or you'd have gotten a sore. I suspect you are closely inspecting your penis for signs of anything. You'd have noticed the sore.
You could go pee in a cup and get tested for gonorrhea and NGU. (They'll likely test you for chlamydia, which isn't transmitted via oral sex, but that's okay - these tests are often run together.) Chances of you having either without symptoms from oral sex are low, but test if it will ease your mind. They will be conclusive.
You can ask your doctor for a type specific IgG herpes blood test to find out if you have hsv1, if you don't already know you have it.
From giving oral, you could be at risk for oral syphilis and oral gonorrhea. Again, with so much time passing, you'd have noticed a syphilis sore. You could have oral gonorrhea with no symptoms, but getting it from oral on a woman is unlikely. You'll need a throat culture for gonorrhea if you want to know for sure.
Go to an STD clinic. Don't just order a test panel. Those are great if you don't have access to a doctor, or don't have insurance, or whatever, but nothing replaces an exam and consult with a doctor who is an expert in the field.
Really, you don't have a lot to worry about here.