Thank you for the Thank You - despite helping people for 20 years and being here since 98 'thank yous' are pretty thin on the ground!
Well first off as a rule you can see any GP at a practice you are registered with, as they get sick, have holidays, have days off and sometimes are over-booked. So yeah just ask to see anyone available when you go in.
Hormones are a problem, in that, if you want to use the NHS there is a prescribed care 'pathway'. Which involves discussion and interview, assessment, and second opinion. This should be a 'joined-up' thinking with your GP (who will prescribe on their behalf) and under the guidance of the standards of care see here
http://www.wpath.org/uploaded_files/140 ... 20Book.pdf you do not have to buy a copy just press the BOOK image for the PDF file. Read it! It is VERY IMPORTANT that you digest that. As it will affect the rest of your life should you continue.
Hormones are sadly changing the body all the time. For minors (under 18) the Tavistock Clinic in London
http://marketplace.transgenderzone.com/?page_id=79 after working with the families may prescribe 'Blockers' you can find out what they are here
http://library.transgenderzone.com/?page_id=2794 they put puberty on hold until the person is adult or decides to change their mind and puberty can continue. It is not a 'Sex Change' as the press so love to say. 'Just' meds...
Anti-androgens are important to combat testosterone. Some report they went straight onto oestrogen (Estrogen) and were fine. All this is carefully decided by someone called an Endocrinologist. They will monitor and give advice based on blood tests to get the balance just right. However, getting a good one who knows what they are doing is rather hit and miss (no puns intended).
For now we need to pull all this back to where we are now. The future is exactly that. For now small steps. And speaking to your GP is the start, as even if you change you mind you still might require some counselling, or psychotherapy. As 'purging' can be very traumatic and might not work. Purging is where transgender people under pressure (work, family) decide in a moment of anger with themselves to take all their femme (or masculine) attire to a charity shop or burn it to exorcise their 'demons'. And the family think it is all over. A few weeks pass and they are shopping again
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This is why you need people to talk to. With the best will in the world, we are online not at your local practice. So you must start there in any event.