Agree with staying off google Heidi, its tends to only ever bring up the worst case scenario and not the other 20 things it could be. I've done it in the past and always work myself into a frenzy, never again.
As far as symptoms go, I had many aches and pains in back and rib 'and leg area, nails were brittle, skin dull, acid reflux. All disappeared within a couple months of quitting, I'd thought it was normal to feel that crap at 41!!!! Had bloods done for a full MOT about 5 months after quitting and everything came back fine, so try not to worry, your body and mind will heal.