Welcome in H.C.M.
In reference to your symptoms I would like to tell you that most likely your cold
had reached to throat by post nasal drip
and this much is sufficient to obstruct the opening of eustachian tube. This malfunction of eustachian tube is responsible for this weired thing.
You may take now-
1- Steam inhalation.
2- Anti histaminic.
If above treatment solves your problem than continue it for a week otherwise consult your ENT doctor for examination and treatment.