1-Remember, it all depends on your testimony. If it is clear that you exaggerated the situation because you were mad at your husband and there was actually no abuse, the case will be resolved in your husband`s favour. However, if there is evidence of injuries, like photographs, hospital visit, records, It may become more messy. You may want to get a criminal defence attorney to evaluate the case and see what evidence the State have

2- Tell you lawyer to  contact the DA and explain your testimony would create 5th amendment problems for you. He/she does not have to discuss what they are BUT implicit in what the lawyer is saying is that some of the statements you made to the cops were not accurate

3- In Massachusetts one spouse cannot be forced to testify against the other spouse. The District Attorney controls the prosecution of the case; but, most District Attorneys will not force a victim to testify. In this case the wife can refuse to testify and the District Attorney has no say. 

Without further evidence the case shall be dropped. The ideal situation is to have an attorney represent the wife's interest.

If you are subpoenaed you must appear in court as it is a court order. It is best not to involve the police in marital dispute unless there is violence

You may refuse to answer questions under the Fifth Amendment.

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We both are intelligent people. We need to know how to compromise and how to work things out without shouting, manipulation, half-true or abuse.