Bad cough? Any suggestions

I've been sick for almost 3 weeks now. Started out just a head cold then slowly went away and came back. My sore throat has gone away but now I'm left with a horrible cough. I don't get any sleep at night. It's okay during the day but horrible as night comes. I've tried cold/flu medicine, cough drops. Nothing's working! And I don't wanna go to the doctors due to not having insurance at the moment. The baby is okay due to me feeling him kick regularly at the same time during the nights. Really need help here. Please any suggestions on what to you? I'm 22 weeks.