Ache in neck back and ribs

hello im 41 years old female i have a problem in my neck which goes down my back and into ribs and round the front specially my left side its like an ache but hurts.my neck i cant move fully from side to side my chest in the centre feels heavy and bruised i havnt done no exercise so i havnt stretched anything im getting worried coz i can also get it in my left arm lik a tired achy feeling.my chest feels heavy even tho i dont smoke and i get missed heartbeats a lot hope u can help me