We are sorry to hear of your situation.
You are not required to be intimate on mikveh night; in fact, you are not allowed to be intimate if one member of the couple is angry at his/her spouse. You should immerse on time in order to leave yourselves the possibility of physical contact, even though you are not interested in being intimate right now. Should you change your mind and welcome an embrace, or should you want to give one, you would be able to act on your desire.
While touch cannot solve problems, it can be a resource for a couple facing them. Sometimes even the smallest of gestures (like a hand on the shoulder), can soften anger. Men in particular can find it difficult to verbalize their emotions when there is conflict. The lightest touch may communicate a willingness to work through difficulties when words fail.
We urge you to seek help and actively work on repairing your relationship. There are therapists and organizations that offer subsidized or low-cost therapy. Alternatively, you may find it helpful to speak with an experienced rabbi, rebbetzin, or mentor.
Please feel free to get back to us with any further questions.
B'Hatzlacha!