Hello,
Recent history of cold may leads to condition called as Serous Otitis media.
The feeling of ear blockage, ringing sensation is all due to that only..
Start steroidal nasal spray and Nasal decongestant nasal drops for better effect..
Steam inhalation.
Next Steps
Consult nearby ENT for nasal endoscopy and start steroidal under supervision.
Health Tips
Donot sniff rhe secretion back.
Do not eat cold food.
Steam Inhalation.