The doctor calls this anxiety

Hi all, i'm new here. I'm male, mid forties non-smoker and play sports. I don't like what is happening and can anyone help?
I have been told by the doctor after an examination that the symptoms I have are caused by anxiety. I don't understnad how or why and if he is just trying to fob me off.
I get light headed and dizzy at any time, quite frequently.
Sore neck and shoulders, horrible hot flushes, breathless, aching chest. I expected scans or something but he just said, nothing wrong just anxiety, relax more.
I find this a bit scary. Does any one have a handle on all this?
Thanks.