Left EarPopping-Head ache. What to do?

When I swallow, I hear popping/cracking sensation in my left ear. It has been happening since 45 days, I have consulted 3 ENTs, 1st one gave few antibiotics and asked to inhale steem and have chewing gum. He told it will be cured in 4-5 days. 2nd ENT Doctor diagnosed A/C SOM, told it will take 7 to 14 days to cure. 3rd ENT Doctor(after 14 days) told at the moment you don't A/C SOM and pressure test in both years is fine. He told there is a vocal strain and there may be some kind of allergy. I took his medicines but there was not relief. 4th I consulted Ayurveda expert and he told to take Josina,mulethi and tankan basam for 15 days. It did remove all the sinus/infection but still the symptom was same. I started reading on various forums and took allergra 120 for 5 days. Till now I still hear clicking sound in left ear when I swallow and there is pain the left side of my forehead. I can feel a nerve swelling in left side of my forehead. Can someone advise what to do?