Been wakin up with .... please help?

Hives!!! had them for almost a month.. they only come when i wake n before i go to bed.. but completely gone in the day. I got meds from the doc .. they helped but i ran out!! my blood work was fine cept my ana test. (auto-antibody test) but i was on penicillin so tht messed with the test. Any who .. wts up with this its been 4 weeks! P.S only hives.. no other symptoms.