There are any number of infections which can cause
night sweats. In addition however, reflux (
heartburn) can cause
night sweats, as can allergic reactions. Furthermore, some people just get them for no particular reason. Thus, that you have night sweats does not, in any way, raise a concern that you might have HIV. As it relates to the encounter in April that you described, there really is no medical reason for you to worry about this or to seek testing. I hope this comment helps.