Thanks for posting your query.
You probably seem like suffering from a bout of viral fever
. The canker sore
could be because of the stress
or the viral fever itself.
It is possible that it could be oral Herpes
If the second guy was to be HIV positive, then again the chances of you acquiring HIV is present though the transmission rates with oral sex
are less compared to other forms.
Yes, HIV is usually present in the saliva and all body fluids of an infected person.
My suggestion to you: please practice safe sex as you already had a partner that was HIV positive. I am glad that you are HIV negative. However, you may acquire an infection later on. Please play it safe.