Hello and welcome to e health forum.
Vincent's angina is a pharyngeal infection with an ulcerative gingivitis caused by gram negative bacteria or spirochaetes (Borrelia vincentii).
This is usually not a presentation of HIV.
But having sex with a sex worker puts you at risk of HIV. Hence you need to consult your doctor and get screened for HIV. Since it is already about 2 months since the exposure, you can undergo a ELISA test for HIV. This will clear all your worries regarding HIV.
I hope this helps.