Welcome in H.C.M.
I have gone through your query regarding sudden hearing loss
after exposure to a loud sound in a musical party, si ce than you are feeling that your ear is blocked.
Your clinical history is in the favour of sensory neural deafness
due to loud soud exposure and it has got a bad prognosis. But you are telling another very important and cotroverial symptom that on pressing the ear or streching the ear the blockade decreases and sound clears up, this is in favor of ear wax
which had got impacted ove ear drum.
So you please consult your ENT doctor for thorough examination and treatment.