My lover was taken from me and imprisoned. i miss him terribly...how do i deal with the pain?

i cant eat i cant sleep i cant find motivation....everytime i hear his name....i want to physically crush that individual. IF its a ex or someone who has been with him....i want to rip them to shreds just for dishonoring him. i need help .. where do i go ...how do i make life happen ? how do i stay focused on US without the pain of his absence?