Referral to head and neck specialist?

Hello I am new here, 

I have had a pain in my left side of my ear and neck for around 4 weeks now, I went to my drs at the start and they told me I have a abscess in my ear canal that was probably causing problems.

I was on antibiotics for a week with no change, so monday just gone I went back to the drs and explained there was no change, they checked my ear again and said a abscess is still there but that wouldn't be causing my symptoms.

Symptoms as follows, neck pain on left side, feeling tired, difficulty swollowing change in voice throughout the day (sometimes crumbly voice and then goes to normal, and a numbness which is hard to explain in my mouth, basically when eating and drinking it feels asthough it goes down the right side of my throat not the left, feel a need to clear throat.

I have no swollen glands or lumps that can be felt, my tonsils are fine, nothing they have picked up on in my mouth.

My drs have phoned ENT and they said due to the symptoms I need to see a head and neck cancer consultant (I have this appointment on the 5th november)

I have just had my blood test results back today as I had them done urgently done, everything is fine with them, which was full blood count, liver, kidneys, arthritis, calcium, alkaline, infection, all these as I said came back fine with no action needed.

I understand no one is medically trained here, but can you have head/neck cancers without lumps? I'm just concerned why I would be seeing a cancer specialist