Thanks for the replies, I really appreciate it from everyone.

I guess I really wanted to post this because I'm just confused by all of it. I primarily use marijuana, and don't really go very long periods without using, so I've never really withdrawn from that. Plus the withdrawals are minor, so that's never been an issue. Other drugs I've experimented with I've only used once or twice, so I'm feeling like I'm in unfamiliar territory here.

I've read about the symptoms, and in fact I've studied substance abuse in school, so I'm really not as ignorant as I'm making myself out to be. I just feel like everything that's talked about in terms of withdrawals from opiates is in terms of long-term, heavy users. I can't tell what's the drugs and what isn't. Depression? That's likely, but it's late fall and I usually have more severe episodes linked to seasonal changes. I haven't experienced anything else, not that I can tell. My life seems to be the same way it was before I started using, but that still seems unlikely.