Estuation tube problems

Anyone else have problems with their estuation tubes due to tumor or radiation therapy. There was a tumor or node that grew next to mine on the left side that closed the “E” tube and cause fluid build up in the ear. I had radiation to destroy the tumor and the radiation worked and fluid disappeared, but since than, my ear fills plugged most of the time and I can hear myself breath and talk through it and it seems to be getting worst. Strange thing is, when I lay flat on my back the ear feels normal. Sounds like fluid maybe but the ENT cannot see any and does not know what is happing. According to the cskan the tumor is gone.