Dear friend, welcome to HCM!
Present symptoms are not apparently concerning.
Nose block during cold can block eustachean tube and resultant pressure changes can cause lightheadedness
Just take decongestants, steam inhalation at home, try valsalva
(gentle blowing out with mouth and nose closed with hand).
It will be alright in its due course.
If there is fever
, throat pain etc. please take antibiotics under medical guidance.
Take care and please keep me informed of your progress.
I hope to have answered your query satisfactorily.