14 weeks with a chest cold. Help

Ki
I'm 14 weeks pregnant with a bad chest cold
It started off with a light tickle cough 5 days ago. After 3 days it turned in to 
I can't stop coughing nose won't stop running/sneezing
My head is pounding 
I've had a low 99.5 F fever on and off for two days.
I called my old ob office and talked to the on call ob to ask what I can have and I was only told Robitussin. Pharmacist told me just Benadryl and only sparingly. 
I just switched insurance on the 1st and have yet to set up with a new doc. 
I need to know what I can do to feel better and how often I can do it. 
I have been using a essential oil blend for asthma that helps when I breath it but only for short periods of time. And I attempt to use saline solution but it makes me sick to my stomach. 
   I would appreciate any advice I can get on how to feel better. 

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