I've been having this dry caugh for almost a month now and i've been taking antibiotics as well as some other meds and it just stays the same. i went to see a doctor and he told me it's just a pharyngitis but i'm worried it could be hiv related?

Get 2nd opinion: First this is not how HIV infection presents. There are many potential causes for a dry cough (pharyngitis is not it) and antibiotic is usually not the treatment . Do you have any nasal symptoms, shortness of breath, or reflux symptoms? If your PCP can't help you, consider seeing an allergist or pulmonologist who are specialists in chronic cough.