Little worried

So I went out in a pool for a couple hours and then probably the next day or day after I would have swollen lymph nodes. And at the same time would get sinus pressure around my eyebrows and they would go away and my nose would feel itchy at times but I wouldntbe able to sneeze. And at times especially at night I’d have dry cough. And now last night I got a headache feeling like it’s wrapping around my head which is maybe a tension head ache but it comes and goes

I have pollen allergies so thar could be it or this might also have to do with stress because of me being worried aboit it I’m not sure but if anyone could loosen my nerves that would be amazing!