when i worry i cant eat i think its shingals?

It started six months ago. and at first I thought it was a bee sting or some kind of spider bite. So I did not think anything of it. So after few weeks the big bump I thought went away. But when I tuched the area it would come back not really as a bump but a red like rash. Now this located in the middle of my back. Now pain is numb but at the same time a nerve sing n feeln, Up an down my back! I wish I new now I did see a doctor about two weeks ago. I no I wated to long but any how he told me that I had shingls but its been three o weeks and that cream he gave me. Now do u think its shingls I'm 20 years old it don't make since and I'm nervice! Thanks for ur time god bless! ( could it be something elce that I should be looking for? This is putting a lot of stress on me. The pain is always in my back. And does it get bader befor it gets better?