How To Predispose My Girlfriend?

Hello, everyone! I would be very grateful if any of you can help me with the "problem". I have a girlfriend. An amazing girl, extremely sweet and beautiful. But recently he began to complain of chest pain. As far as I understood from her is something like tension rather. But whatever it is, I really want to help her feel good in her body. When he lies down on the bed and turns slightly to one side, he immediately begins to "shake". I reassured her by telling her that there were some hormones ... AND NO, SHE IS NOT PREGNANT !!! From here something else appears ... She is among many people all day and that is why she tries to look good and it really is so. I told her to undress (I would even suggest she put on my T-shirt) and stand for a while without a bra / bustier, because the pain might be caused by them. But she's one of those cute girls, who are quite shy and accordingly refused. Give me advice on how to predispose her so that she feels good. I'm even ready to give her a breast massage. I hug her a lot and I'm always by her side. I would do anything for her! If anyone can help me, I will be very grateful!