HI Everyone

I have developed severe Generalised anxiety and Health/illness anxiety. I am constantly anxious all day everyday and I constantly feel as if Im dying of a health issue, this issues switches between blood clots in my neck (most common) Heart attacks, Pulmonary Embolisms, various cancers, strokes, brain aneurysms, rare bacteria and viral infections and illnesses, internal bleeding, meningitis, phenomena etc. I have chest pain/discomfort and a tightness and throbbing in my neck, weird feeling almost like its a nerve thing in my head practically everyday and its really worrying. I am constantly anxious all the time and worried about the fact that im dying or could be dying in the future even if I have no physical symptoms and its getting worse. I am having what I think are panic attacks regularly ranging from the start of a panic attack (mild) to me going into my Mum & step dads room at ridiculous hours crying, panicking presenting with a variety of concerning physical symptoms that are indicative of heart attacks, strokes, meningitis etc. and begging them to help me, to call a doctor or take me to the ER. Its stupid because logically I know that nothing is probably wrong with me and that its probably anxiety or something like a muscle ache but its the fact that there is always a chance (however small it may be) that i'm right and that something might actually be seriously wrong and requires medical attention is really distressing but my parents wont take me seriously. I will often go to the doctor with my symptoms and they will dismiss me in a subtle way and say its fine or nothing etc and they wont take me seriously because i'm 17 and anxious, I just want the doctors to take me seriously and to do some tests to check my health and then if the results are clear I can (hopefully) put my mind at ease so that way I know its almost certain my symptoms are anxiety or stress induced. Im also scared to go to sleep in case I die in my sleep as there are a few medical conditions that can cause you to just die in your sleep without warning and this is really terrifying because I don't have any control over it. I have been to the GP and given a mental health care plan and have been refereed to headspace which is good but I have just been told that I wont get my first session for 2-3 months and I don't think I can cope that long with the anxiety and I also have to worry about yr 12 and im doing academic subjects. I feel like im losing it and im not coping.