Worried I have throat cancer and can't shake the thought

I've been suffering with a feeling of every time I swallow especially my own saliva there is a lump in my throat. Now my GP seems to think it's a thing called Globus sensation, but the health anxiety I suffer with always brings me back to the same conclusion CANCER. I have had the lump in the throat feeling for about 6 months now and it is really starting to depress me. It has changed the person I am because it's all I think about. My family has noticed a massive change in my personality and I'm not sure how to get out of the situation I find myself in.