My ent says i dont have anything in my left ear but i feel fluid in there. what could it be? how do i get rid of it?

Pressure in Ear: Sensations of fullness in the ear with no physical findings plus a history of taking allergy medications can be caused by Eustachian Tube Dysfunction. The middle ear chamber is air filled and relies on the Eustachian Tube to keep equal pressure with the outside. Upper airway congestion can block the tube causing a fluid sensation. See your primary care doctor or Allergist for treatment options.

Eustachian tube: If you did not have,tests for middle ear,a good idea together these done,however,I presume and it sounds like Eustachian tube dysfunction,if hearing is normal,decongestants,with valsalvas exercise(pinching your nose and try blowing your cheeks)to eQualise pressure in ears.