My first suggestion would be to find a support group of men going through divorce. In a group setting you will likely find that what you are going through (such as feelings of helplessness to protect and care for your daughter as you want to) is not uncommon. People who have already gone through these situations can be some of the most helpful when in comes to learning how to handle situations without self-destructing.
If you cannot find such a group locally, I suggest you start therapy with someone (social worker, nurse practitioner, psychiatrist, psychologist, etc.) so that you have an objective person to listen to you on a regular basis and provide you with feedback and suggestions. There may even be therapy groups that someone in your area could recommend.
When you lose your wife (who is often your best support, at least initially when you get married) you can feel very alone with such overwhelming problems - dealing with your ex-wife, attorneys, the courts, etc.
Eventually, I hope that things will improve within your family to the point that court matters are finished and you and your ex-wife are in better agreement on things. I am not saying you and your ex-wife will ever be on good terms, but at least there should be some settling and calming of the conflicts over time.
This is often the case. Try to look at the current situation as a period of time that you have to survive, after which things will become easier.
Until then, look for a support group. If you cannot find one then call a therapist who has experience working with men going through divorce and child custody issues. Men have very different experiences and feelings about these issues than women do.