Well, depression manifests itself in many different ways, and a sense of hopelessness is one of the symptoms of it.
Sounds like you are feeling hopeless and quite "numb" right now.
I'm not a Doctor, just a poster, and if I felt as you do right now, I would contact a professional that can help (eg: a Counselor, a Physician [general practitioner], a Specialist, etc). Also, let them know of your weed smoking.
You did not specify how long you've been smoking weed, but let your specialist know that also.
I don't know if the marijuana has contributed to your possible depression or not, but I'm sure it did not help it at all.
Recreational drugs are different from medicines prescribed by a Doctor. Also, your Doctor/Counselot/Specialist may know of a specific place (eg: a drug rehabilitation service) that helps people overcome the results of marijuana use.
Thus, you may be needing help in two areas: 1) help with your possible depression, and, 2) help to overcome the need to continue smoking marijuana.
OH yeah,also all this came from smoking weed.