Hi Andy,
Not trying to get on your bad side with this. To be frank, the questions you've raised about your immediate physical well being suggest you don't know as much as you need. Your initial concern about a sexual contact... that's pretty darned normal. Everyone's been there in one fashion or another. Myself included.
Where you slip on the learning curve are concerns about your throat, digestive issues, general physical discomfort, etc. -2 to 3 days out from your contact- as being possible signs of HIV infection.
Unless you have a stunningly powerful immune response, you aren't going to feel ANYTHING at all. First symptoms will not appear until your body produces antibodies to the virus and their battle begins. That response 'could' happen in as little as 2-3 days, but there's a reason they tell people to wait up to 6 months before using an HIV test that tests for ANTIBODIES, not the virus itself.
And when that response happens, as someone has pointed out, the symptoms are FLU like. Nothing at all to do with thick mucus, runny stool or feeling under the weather. In order for HIV to manifest random symptoms like that, you'd have to progress from HIV+ to full blown AIDS. That's not going to happen in a weeks time.
You may be ill, but not as a symptom of HIV. It's more likely you've ingested a bit of fecal matter during your sex play.A risk when playing with someone's butt. A finger goes up someone's butt. Then touches a nipple. You decide to suck that nipple.... Walla. Deed is done. Having them douche and shower before sex play can lower the risk of that happening. But there's always a risk.
I'm no doctor and I don't assume to play one on a forum board. But having encountered just this 'problem' before, as it was explained to me, your body is producing the mucus to surround and trap bacteria. This mucus ends up flowing down the digestive tract. It is disagreeable to your digestive system. That's what is more likely going on. It can take anywhere from a few days to over a month for your body to recover on its own. Shorter with the right antibiotic. (Pesky little germs are getting better at fighting back.)
So bottom line, your discomfort is likely a mild case of eye, nose or throat infection. As far as HIV goes, your 'risk' is super low. Unless you are remarkably, remarkably UNLUCKY.
Either way, there's no point in worrying about HIV. Get a test in month 3. Repeat in month 6.
If an STD is involved, HIV shouldn't be your worry. Hepatitis C could be the greatest potential risk since it can be transmitted in the manner of the sexual contact you had. Even there, keep in mind, you're not going to be 'sick' from an STD 2 days out. It takes at least 7 more minutes than that.
As I said, now is as good a time as any to read up on these things. I'm sure you already know about condom use, etc. etc. So pose the kind of questions to someone medically reliable. Ask THEM about symptoms... The what and the when.
That way, the next time you likely to feel like the 'worried well', you won't worry so much.
Just trying to help.