Hi Mumu,
I would suggest that you look for a store local to you where you can go and visit. It may be a bit more expensive than say an online store but you will be able to see and feel the crystals and choose the one that suits you best. It is far better to choose from a good range in person and see which calls out to you rather than choose a crystal from a book and then go and find one. Quite often what people say in books is how they feel and you may feel or react totally differently
I am so sorry to hear you are unwell, if you give a brief outline of the areas that you are looking to help then I am sure we can suggest a few crystals that you may benefit from investigating further
