The only adult risks for HIV are:
1) having unprotected, penetrative vaginal or anal sex with someone of unknown status, or
2) sharing intravenous drug needles
You did not get HIV from this event. No one has ever contracted HIV from a hand job - because it is a zero risk event for HIV.
Receiving Handjob with or without out sores / cuts on other party hands makes no sense.
This is not a HIV concern at all.
Sexually, only unprotected vaginal or anal is a risk for HIV.
Your diarrhoea has nothing to do with HIV.
Move On