welcome to health care magic,
as per the description of your details, you just had changed the Brand names of the medication but not the original drug..becoz both the names contains same medication, so dont worry about that and , more over the clopidogrel
doesnt cause any cold
or headache , this may be related to viral infection.
i assume , its not a alarming sign to seek a medical attention , if the problem persisit , consult your treating G.P. also check your blood pressure..