Yes

Acute disseminating encephalomyelitis can occur as a consequence of a bacterial or viral infection (including HIV), following recovery from infection with the malarial protozoan, or as a side effect of vaccination or another inoculation.

Please be aware that HIV can not be diagnosed from symptoms and that very many people who become infected with HIV will experience no symptoms at all - and, on the other hand, just worrying about the possibility of having been infected (even though you haven't been) can mimic symptoms that may be associated with the acute phase of HIV infection.

If you have engaged in a high-risk activity and are genuinely worried that you may have become infected, then the only reliable way to find out is to take an HIV test.

A pain in the penis is not generally recognised as a symptom of the acute phase of HIV infection, but it is a recognised symptom of several other more common sexually transmitted diseases (infection with which generally make infection with HIV more likely).

No, pulling out will not avoid HIV infection.

That is what HIV does. However a super infection,multiple strains of HIV infection or duel infection,HIV with hep c etc will degrade the immune system further.