Before calling it psychological, it is important to rule out physical causes, either by detailed history, tests or both. Sexual activity is a complicated process, and problem in any of its components can cause problems. A detailed evaluation is necessary for zeroing in on the exact cause or causes, which include decreased sexual desire, guilt (if any), strained relationship with spouse, psychological probelms like depression
, physical problems like diabetes
and also some medication.
It is advisable to take a second opinion from a psychiatrist
(especially one who runs a speciality sexual clinic because not everyone is comfortable dealing with such problems) to get the problem sorted out. Psychiatric consultation becomes more important now as your husband has suicidal thoughts. Try to remain calm and dont blame each other for the condition.