Need advise, My Boyfriend doesn't seem to understand?

Hi, I'm 16, and I have been very stressed over the years, and I mean severly over school, family, friends, and even my relationship with my boyfriend. I've had major pains in my heart, heart palputations, dizzyness, feeling faint, calapsing and lately, i've been experiancing memory loss and I've felt like this for over two months now, I couldn't remember anything mainly good times that I've spent with my boyfriend, the feelings I had for him seem gone and I feel numb to things. I've talked to my boyfriend about this, and instead of getting support, he just insists that I'm complaining about what I feel,and I don't think he understands how serious this is...What can I do? Did I do anything wrong?