I advise that you most definitely see a dr asap if you feel like that.

There's not much you can really take but you definitely need a dr to be taking care of you. I got the flu when 25wks with one of mine, a simple flu that had my dd affected for a few days had me knocked down and took a month to recover from. I had an OB appt so went to that, my bp was 65/40 (extremely dangerously low) and i was coughing so much they thought i had whooping cough. I was admitted immediately and put on a drip in clinic before they sent me to the ward where i was put in isolation. I had fluid on the lungs as well. When i went home i spent the next week in bed on panadeine forte as the codeine in the forte's is what stops you coughing, this is the only thing i was allowed to take.

So please, see a dr, cos you sound as bad as i was.