Ear block can be due to sluggish eustacian tube(the tube that connects the ear with nose). This can be due to nasal allergy, sinusitis etc. Simpl method is to practice Valsalva manoeuvre 2-3 times a day (Check some YouTube videos). And get yourself checked for nasal problems.
Next Steps
Consult ENT specialist and get yourself examined
Health Tips
1. Steam inhalation
2. Valsalva manoeuvre