What is the medication i can take for my colds...

When there is a loss of smell, a rise in temperature, shortness of breath, diarrhea, cough and a sore throat, it is necessary to isolate yourself at home and contact the competent medical authorities to rule out infection with Corona

How to treat cold that continue for 2 weeks

this condition may be due to sinusitis with bacterial infection resistantto the antibiotic you are taking and to solve this problem you can has nasal doscharge culture to detect the bacteria and giving it suitable antibiotic and the cause may be due to infection with epstein barr virus which can be treated by antiviruses like Acyclovir  or ganciclovir 

How to diagnose cold that continue for 2 weeks 

you should be assessed by ENT physician to examine the throat and the nose to exclude the presence of siusitis and a sample can be taken from the nose or throat to help in diagnosis and monospot test and be done to exclude epstein barr virus infection

What are the causes of  cold that continue for 2 weeks 

infection with antibiotic resistant bacteria
epstein barr virus infection
weak immunity

advice

you should follow up with the physician to do the lab tests and provide the treatment