My Worries

Hello, im a 14 year old boy who lives in a humid climate and that causes allergy issues but a few weeks ago I went outside to mow the lawn. That day was a normal day and I felt perfectly fine afterwards. I decided to take a shower and when i got out there was some phlegm in my throat. When i got it out it was blood red. A few weeks of this going on caused me to have deep chest pains and a wheez to my breath. The doctor said the blood was allergy related and I did have asthma awhile back. The doctor allso told me to use a hunidifier and a sailene solution for a while. After that I went up north to my grand parents for a bit. The chest pain stopped and after a few weeks up there I was fine with no nose bleeds at all. Then when I cane back to my parents house the chest pain came back and my parents say I have anxiety and hypocondria. Theres just a part of me who cant cope with thee fact that Im not sick. Im going to see my mothers shrink on the 14th a d Im hoping tbat this visit will help me with this. I keep worrying that I have lung cancer or some other type of illness and I just need help with this.