Mr. Ivakhnenko's answer is right.
I would add the following: you said that you cannot cope being alone. I certainly can relate to your feeling. However, if you let your feelings run away with your reason, and if your husband makes representations about his immigrant intent when he applies for his B-2 visitor visa, and if he is found to have lied or stretched the truth, YOU ARE GOING TO BE ALONE FOR A LOT LONGER than the few months it will take to process the K-3.
I know that this is difficult for you. You must recognize that this kind of difficulty -- and many others like it -- are part of the immigrant story in the USA. This is simply the way things are. Some things can go faster. Some things, not.
Do not jeopardize your husband's future and your own happiness. Follow the rules.
I must remind you that although I am an attorney, I am not YOUR attorney. The information I am providing you is general information about the law. If you would like specific information or advice, I am going to suggest that you make an appointment to come in, or call, to chat with us.
Pay attention to the nuances: K3, as you already know, has an immigrant intent, B-2, as a non-immigrant visitor's visa must have no immigration intent, thus, as it follows, by applying for a B-2 visa your fiancée will be misrepresenting his intent as he would be marrying you in the U.S. And material misrepresentation and its consular submission will be false from the start and will affect your case drastically. I suggest waiting for K3, do it right.
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