You can't get hiv if you use a condom, so if she told the truth she is negative. It seems the condom fell off when she pulled out and her penis was always inside it while penetrating you (so you wouldn't be exposed since hiv is instantly dead in air), but only you can figure that out. Did she think the penis was always in the condom until it hit the air?
hiv doctors are unable to diagnose from symptoms so no one here pays attention to them either. You should also not try to identify if your urine flow (or any other self diagnosed symptom) has anything to do with hiv since it will be a waste of time, and can ONLY increase your anxiety as you find out and realize that it can't prove anything.
There is a reason you are told to start it within 72 hours - that is what the FDA approved it for after their review. I would stop taking it immediately since there are potential side effects and no known benefit to taking it late.
You didn't answer my questions, so please update. I'm not sure you had any risk so providing further details might be useful.
1 Was all of the opening of the condom outside your anus? If so, the penis was always covered when it was inside your anus providing she did not penetrate after losing the condom- which it seems did not happen, so you would be safe.
2 If the condom was stuck in your anus, then the opening would be hanging outside so was all of the opening outside you.
3 Can you contact the other person?
Most condom slippages during withdrawal happens due to incorrect handling. The tip has to be help during withdrawal.
That being said, it is obvious to assume, you were protected through out the act and therefore testing might not be necessary.
It won't be a bad idea to just get a IV Generation HIV test at 28 days from the date of your last PEP dosage, this is purely advised since you engage in anal intercourse and you are sexually active. Not only this will get you a routine check but would also bring you your own peace of mind.
There is no point in talking about symptoms since they are never used for diagnosis of HIV. Also, your symptoms don't seem to be specific to HIV ARS.
I strongly feel you are fine but you do suffer from some anxiety, if you have underlying issues that contribute to your anxiousness, a seating with a therapist can resolve a lot of it for you.
We wish you good luck.
Correction: Most condom slippages during withdrawal happens due to incorrect handling. The "ring" has to be help during withdrawal.
How much of it was sticking out? If the whole end with the ring on it was outside before you even tried to take it out then you know you are safe, You say it was hanging and flapping, so that sounds like the ring was outside.
This forum is specific to HIV prevention. I urge you to seek answers to your questions in context to other STIs in relevant forum.