Does marijuana produce serotonin?

My girlfriend tells me she uses marijuana to calm herself if she is having a stressful day. She has been doing this for many years. She says smoking pot is like self-medicating — it is better than using anti-depressants. She also claims smoking pot helps with depression because of how it helps produce serotonin in the body. What is serotonin and how does it help depression? Does smoking pot really help with managing your anxiety, depression, etc.?


What are golf nodules?

I've noticed what appears to be a wrist bone protruding on the back of my right hand. It's on the thumb side and closest to my forearm bones. I've been playing a lot of golf lately, and someone told me it was a "golf nodule." If so, what are golf nodules? Is this dangerous (it doesn't hurt right now), and do I need to do anything about it?


Is there a connection between emotions and physical pain?

When I hear someone make a negative comment about me it sometimes sticks and for some reason my chest will begin to hurt. A friend of mine said it was emotional shock. For a while the feeling went away, but then it got worse. Now the pain will range from my heart to my left arm, depending on how badly (depressed) I feel. In general, I want to know if I should be concerned or if it's just as my friend says: "emotional shock," that's just gotten worse.