His Blood Spoke My Name said:
For a physical problem, yes. For a mental problem, no. I would reccommend the Lord for that
There are physical problems which exhibit as mental problems. I have a son with intermittant seizure disorder. Yes, he is profoundly retarded, but about two years ago, when he was 20, there was a sudden bizarre change in his behavior. He would be calm, placid, walking along and then suddenly turn on one of us and hit and wrench and pull hair and yank off our glasses. He wrenched Barry's head around so hard one time it took about two months for the pain in his shoulder to go away.
Another time, another place and maybe would have called it demon attacks or something similar. We were blessed enough to be put in touch with a pediatric psychiatrist who recognized the symptoms immediately. Chris' brain is short circuiting at times and these fierce anger episodes (which only last a few seconds at a time) are the result. The answer? A drug called trileptol, twice a day. Chris has evened out. He does not act drugged at all, but there are no more anger episodes, either.
In a similar way, induced chemical inbalances can cause severe, though usually short term, depression. Local anesthetics do that with me. Not when I get them, but when they are breaking down in my system, a day or two later. When I was little, after a trip to the dentist, I used to spend the afternoon sobbing on my bed. My mother called me a hypochondriac and a dramatist. It was not until I was in my FORTIES that a dentist finally was able to pinpoint what has happening -- after one episode where my son had sat on the edge of my bed a day after a trip to the dentist, afraid to leave the room, because I was truly suicidal due to that depression. A day later I was fine.
But what if the chemical inbalace is due to something more long-lasting? As was mentioned before, tumors can do this. So can a multitude of other things, including some types of allergies.
If depression is not your normal state and if the onset is severe and sudden and you can't get rid of it, please, please see a doctor. It may be as simple as an allergy or as dangerous as a tumor and there are at least a hundred things in between which can exacerbate a minor problem and make it threatening. Rule out the physical.
By all means take it to the Lord and ask for wisdom for you and for the doctors you are seeing. And if there is nothing physically wrong, then get out of the house and get to helping someone quick! Get your mind off of yourself and onto someone else, or a number of someone elses.
Love your neighbor as yourself is one of the best cures for non-physical depression there is. And it can really help you to love the Lord more, too! Reading the Bible is, of course, great and to be done on a daily basis. Living it is also to be done on a daily basis.
That way, even if there is a physical cause, you are still aiming in the right direction and the Lord can use whatever is going on to His glory and your benefit.