The best treatment for depression is antidepressants and cognitive behaviour therapy.  Loss of interest in all spheres of life including sex is outcome of the depressed condition

Dear Friend. Severe Depression could need Psychiatric treatment with medicines. Consult a Psychiatrist.

Hello dear I can understand what you are going through. But you don't need to worry about this. There might be many reasons because of which you are in depression. Some you might be aware of and some you aren't able to identify. Whatever the reasons are, before depression hampers your daily emotional as well as physical well- being more and more, contact a Counsellor or a Psychologist now! You can also contact me and we will together discover the reasons as well as how your life could be back on track. Don't worry, you got this!

Sorry to know that you are in this state and would tell you to be hopeful that you can come out of this with appropriate efforts . Very little information we know to  what stage of depression you have . Starting psychothereuptic counseling  is very advisable  , as depression results in dysfunctional thoughts and poor  cognitive functions ,to treat this  there are therapies  that work with your cognition and thoughts . Self help tips Exercise,  medication,  mindfulness,  relaxation techniques,  reading books , deep breathing These tips help our body to  oxygenate brain areas better . Release endorphins , the happy feeling molecule.

It looks like that something is bothering you or some incident is bothering you.. Probably, You are not able to resolve it.. Do Consult a psychological Counselor to overcome this issue..