Hi I've Got A Really Chesty Cough And I'm Bringing

Hi I've got a really chesty cough and I'm bringing up a lot of mucus which is clear. I've just finished cough medicine (Robitussin) and my stomach is sore with coughing. I still have the cough. Is there anything else I can take I get. Bit breathless as well with it all,I've had it since Tuesday. Can you advise please.