Husband cheated & has a drip discharge now from his penis.before he told me & onset of symptoms we had oral, anal & vag sex. i have a sore throat, muscle/joint pain & chills/weakness. is cephalexin or clindamycin effective treatments for chlamydia?

These antibiotics are not reliable against chlamydia or any other STD. You need professional exam and testing. Your husband's diagnosis should be established (gonorrhea? chlamydia?), but don't delay; you need proper treatment for both. You cannot do this safely without professional evaluation and advice. However, your symptoms may be due to something else -- not typical for any STD. Good luck.