Hi , I'm 17 and have been unwell since January it all started off with a tight feeling of fullness one night in both breast which lead to being told I had costochondritis ( inflammation of the rib cartilage) . Since then I have never felt completely right as being told I am anaemic , low in b12 , folate and vitamin d , I keep getting this weird feeling that I have some form of cancer because my symptoms fit very well as I have experienced headaches , nausea , loss of appetite in the past few weeks which have worn off except the headaches and the occasional pain in my stomach and I also think I might have swollen glands in my neck which have been worrying me for over a month but the doctor didn't see anything wrong . I put my breast problems aside as I thought it was because of my costochondritis but now 4 months later I feel like my breasts feel lighter and look slightly smaller and I am not sure why I am getting worried as someone who I work with said she thinks I've lost weight and I don't know how because I haven't tried to I am just terrified the doctors are missing something , personally I don't think I look like I have lost weight but I can't help but think what if I also have gained really Bad health anxiety as things started to slowly get worse .