This answers all of your HIV questions, and if you can think of any more just reread about the 3. You had zero risk therefore testing is irrelevant to your situation because you had zero risk. HIV is a fragile virus, which is instantly inactivated in air and also in saliva which means it is effectively dead so it can't infect from touching, external rubbing or oral activities. It doesn't matter if you and they were actively bleeding or had cuts at the time either because the HIV is effectively dead.
Only 3 adult risks are the following:
1. unprotected penetrating vaginal with a penis
2. unprotected penetrating anal sex with a penis
3. sharing needles that you inject with.
The only way to get HIV is if you did one of the 3. The situation you describe is a long way from any of these 3.
Even with blood, lactation, cuts, rashes, burns, etc the air or the saliva does not allow inactivated virus to infect from touching, external rubbing or oral activities. This HIV science is 40 years old and very well established, so no detail that you can add to your encounter will change it from zero risk. Because of all the research statistics, doctors have calculated the risk from what you describe to be less than that of being hit by a meteor, therefore no one will get HIV from what you did in the next 40 years of your life either.
If you didn't have one of the 3 then you are just worrying about your own hiv theory - which is unrealistic for you to think that can become reality - so you should move on back to your happy life instead.
It is unlikely that you even know the purpose of lymph so you should not be poking it and irritating it.
Yes, no one has gotten HIV through oral sex. There isn't a single, documented case. Sure, you find 'stories' on the internet but the internet is full of false information. You will not get HIV from giving oral sex to a male partner (or receiving). Saliva has enzymes in it that break down the virus and render it inactive. I think you understand lymph nodes and am not sure why that comment was made. If you have a reactive lymph node, I would think about if you have been sick in the past six months. Having a lymphatic response is not uncommon and can happen even if we have a cold. It can happen for a variety of reasons. But in your situation you've explained, it is not at all because of HIV.
Adults only get HIV from unprotected vaginal or anal sex or sharing IV drug needles. Don't do those activities, you won't get HIV.