Ears popped in flight. Fenfedrin tablet.

I have a flight journey in few days from USA to India. I am afraid of pressure level problem in ears and ears are popped as the hearing probelms exists. When i was coming tavelling to USA I faced this problem and contacted the pharmacy in airport. They suggested one medicine called FENFEDRIN and asked me take the tablet for every 6 hours in flight journey. I took the same medicine for every every 6 hours. After the flight landing my ears are some what better but the pressure level problem found in the back side of the head because not able to hear the sound in the same level as like the ears popped. Now how can i resolve the pressure level and ears popping issue in my upcoming flight journey through any tips or Shall i use the same FENFEDRIN tablet.