Dont worry, since you have already seen a doctor, there is no real cause to worry.
You can try some of these measures till you get to the doctor again.
OTC antitussives: Brand names - Triaminic Cold & Cough, Robitussin Maximum Strength, Vicks 44 Cough Relief take two tsf three times daily.
OTC antiallergics: Benadryl Allergy, Nytol.
Humidifier: use a humidifier in your room at night, this helps in cough.
Menthol steam inhalation : this is also very useful, take some staming hot water in a bowl, add Mentho salts available OTC and inhale the steam.
Logenges: such Vicks cough logenges or any hard sweets constantly, this will cause a constant flow of saliva and give you relief.
Fluids: drink plenty of water.
Humidifier: use a humidifier in your room since drying of the sinuses can cause this.
Warm compresses: warm compresses on the chest areas will give relief.
Vit. C supplement: 1000 mg Vit. C supplements daily (available OTC).
N- Acetyl Cysteine: this is a supplement available at natural food stores which helps drainage.
These steps will hep you dont worry.
Hope I have been able to clarify the situation for you and helped in resolving your query.
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Thank you and I wish you the best of health - stay safe!
Dr. P. Jyoti