Hello, thanks for using HCM.
It is more likely that you are suffering from traumatic pain of the testes following the encounter you had. its possible to have sustained blunt testicular trauma
with formation of hematomas or to have had a partial compression of vessels leading to ischemic lesions in the testes. It is also possible to have sustained trauma of the epididymis
which is located just behind the testes.
Concerning your questions, STDs do reoccur but its less likely its an std that you have. HIV
is not transmitted though saliva unless the mouth has wounds through which bits of blood can be transferred to the other person.
As concerns your case, it is necessary to see a doctor for a proper examination and teats such as urinalysis
and doppler ultrasound
Best regards and hope this helps