Explanation:
It is normal - it happens to many people. As you are improving in your practice (eg. Da Bei Mantra.....) you are purifying your mind and your body. You body beomes more and more sensitive.......to a point......your body does not want to take in meat any more .......you "naturally" become a "vegetarian".
解答：
这是很普通的，并且发生在许多人的身上。因为你提高了你的修为（例如：念大悲咒……）从而净化了你的精神和肉体。你的肉体变得越来越敏感，必须指出，你的身体不会再接受荤食，你会自然而然地接受素食。
In this process, some people might throw up (like your situation), some people might have skin rashes and blisters, some people might have diarrhoea, stomach ache.....or not feeling well eating /smelling meat.
在这个过程中，有些人会呕吐（就象你现在的情况），有些人会起皮疹和水泡，有些人会腹泻或者胃痛……或者对吃荤和闻到荤食味道会感到不适。
Sometimes, it is because your body is sensitive to the poison in the meat. Sometimes, it is because you are so sensitive to the "sufferings" of the animals when they were killed.......
有时，是因为肉体的纯净而感到荤食的毒性，有时，是因为肉体的纯净而感到动物被杀后的“痛苦的怨念”。
In Buddhism -- it is called "Discovery of the Root of Goodness" - Shan(Good) Gen (root) Fa Xian (discovery)
佛教上称之为“发现了仁慈之根。”
It is a good thing, a healthy purification process -- happens"naturally"
No need to worry !! It is going to help your progress in your Buddhist practice. (or other spiritual practices) You will find yourself healthier, more clear in your mind, and more energetic....
这是一件好的事情，一种健康的净化过程，很自然的，不用担心！！将会帮助一在佛教修行中取得进步。（或者其他的灵性修行）你会发现你更健康，头脑更清醒，并且精力充沛。
It usually does not happen to every one, it only happens naturally when you are "ready" !!
这个不会发生在每一个人身上，仅仅会发生在已经“准备好的”人身上。
Therefore, we have "no need" to talk anyone into becoming a vegetarian. When they are ready, they have no choice, and they will do it naturally.
Forcing anything to happen is no good.
因此，我们不必去劝说每一个人去吃素。当他们准备好了，他别无选择，并且自然而然的吃素。强迫什么事情都不太好。
You are welcome to contact me if there is any further question.
Many of us have a lot of experiences with this.
P.S. How long has it been ?
如果你有更深层的问题欢迎你和我联系。许多人都有此经验。
顺便问一下，这种状况多长时间了？
