Hi all, I need some advice!

I've had a dull ache in my upper back all day, it only came on this morning. I thought it was just that I had slept funny or something, but then I did a bad thing and googled it, and I've just read that it could be an early symptom of lung cancer!! So now obviously I'm bricking it.

I haven't officially been diagnosed with health anxiety... yet! I was looking to go to the GP about it this week. I obsess about EVERYTHING. I've already been to the doctors last week over bladder pain, I've had two urine tests which were clear and the bladder pain's gone now, the doctor said it was probably just a water infection.

I'm 21, I did used to smoke but not a lot and I've recently quit.

Can upper back ache be a symptom of anxiety? I think it's starting to settle down now. I've had palpitations and acid reflux/heartburn also. I'm really really scared :(