I am thinking about starting to take st johns wort, as it states it helps moods.. which I have been having mood swings among other things. I also am having trouble sleeping lately so I take Valerian at times and am going to try Melatonin other times.. Is it okay to take these things together?

And. does anyone have experience with st johns wort? I don't know if I am depressed but I do have some of the symptoms. I am going to the DR. Feb 13th for my sleep issues. Can that Dr. Help me decide if depression plagues me, or do I have to see a psych? I don't have insurance so I need to keep the bills down!! thanks!