Dry cough with mild runny nose, cough worse at night

Hi,

Question for my 6yo daughter and myself (44yo dad). My kids and me have a tendency to catch cold (sore throat, cough etc.) relatively easily if we have something cold, like icecreme, but don't follow it up with something that will warm the throat, like warm water. Recently after having ice-creme, daughter we forgot to give warm water to daughter. Also, she used a hotel swimming pool a for an hour (which she is not at all used to). By evening she had runny nose, quite a bit of cough (dry), which got worse when lying down, but was okay once she slept. Next day she got 102 deg F, fever which subsided by evening (we had to administer Paracetamol). Fever hasn't returned, but cough got bad. She work up few times in night due to cough. Since this morning, I also have started having coughing, very mild running nose, slightly warm around nose -- a feeling I get with an oncoming onset of cold.

Daughter has been on Heparsulph 200 for last 2 days, and I started same since this morning. However, wondering if anything else should be given for the cough. My cough is not that bad yet but I feel it might get worse, and daughter's cough is slightly better today, but afraid of it worsening by nightfall.

Kindly advise.