The medical term for that feeling (which some people call "a hair struck or a lump in the throat") is globus sensation. At times, it is associated with difficulties swallowing. They are probably related to psychological problems. The most common cause is gastro esophageal reflux disease - GERD.
Other causes may be irritation due to post nasal drip, allergy and infections(like sinusitis or sore throat).
Diagnosis is confirmed by fibroptic laryngoscopy. For confirmatory diagnosis, pls consult an ENT specialist as clinincal examination is must for diagnosis.
Hope it helps.Take care and pls do keep us posted on how you are doing.