Ooooh, babe! You absolutely have my understanding and sympathy! I have been battling this for YEARS!!! Would you believe right now I am writing this from hospital! I lost my hearing last Saturday and I am in for IV steroids for a week. I have an MRI scheduled for Tuesday (I am not in the UK hence the excellent treatment ;) !) but despite everyones predictions that this is nothing more than some lousy virus I am constantly fighting panic that the MRI is going to reveal something scary and untreatable.
I have freaked over everything from breast cancer to Motor Neurone Disease to various tumours to MS and everything in between. You MUST get help because it actually WILL make you ill!!!
First - I recommend a great book: "It`s NOT all in your head..." Gordon J G Asmundsen. It deals specifically with health anxiety as a disorder. There are fabulous exercises in the book and for home-therapy it is a great guide. i pick it up and go through it again as well just when I need a little kicker of reassurance.
I am also using the "Anxiety and Phobia Workbook" by Edmund Bourne whcih is more holistic and looks at anxiety in general but it useful for recommending a wide variety of treatments.
DEFINITELY get CBT and stick with it as far as you can - it will really help you identify the root cause of the problem - mine was fear of death and dying,and leaving my babies with no Mummy. It definitely got worse since I had the kids and I am living in a foreign country too, so I have the added pressure on myself that if they lose me they lose their "Britishness" (they are half Japanese).
Absolutely consider getting SSRI treatment as well. I used Prozac and it was absolutely wonderful. You can take a low dose (I was on 20mg) it has very few side effects (but there are options to switch to a different drug if you do find you have them) and it really really helped me manage the condition while I got help. It takes about 8 weeks to kick in. It doesnt "cure" you of your problem, but you will find it makes it easier to manage - you miraculously wont seem to worry so much!
Isn`t it frustrating when friends and family seem to laugh off your concerns like it is nothing, and a bit of a joke. It is real and very debilitating and the panic that comes with it can be totally unmanageable.
I am still working on mine now, but I can tell you that with the above you WILL see an improvement. I am testament to that. I have just under 2 days to go now till my MRI and all the time in the world to sit here in hospital and think about it - but I am really doing ok. Relaxation exercises, positive self-talk - all the things that sound like fluff-stuff are actually getting me through it. You can get over this! Good luck x