Help with mysterious pain?

[Bobbie]

So I know that I've always been a bit more sensitive to stress then the average person. That I've adjusted to and have tried to be alright with. However, lately I've been having pains in my chest that only come at night and then goes away by the morning. They're not sharp, rather they're just like as though I've had a good workout and it all burns. This and my back is stiff, almost as though again, I've been working out. Now I don't have a terribly active job and I know I'm not putting my muscles out in the least. The only conclusion is this could be due to my anxiety and worrying I'm having all the time about my relationship, with my boyfriend. I find it a struggle not to worry and fret about things my boyfriend said or i said, and to analyze it death. I feel sad a good part of the time so I'm not sure as to how that plays into all of this? If there is anyone who could help me to understand these symptoms and to help me, in any way that would be fantastic. I feel as though I'm living under a cloud a majority of the time. Thank you so much.