Hi, The Other Guy: You say you "used to have" depression & suicidal thoughts... That would suggest you no longer have depression & / or suicidal thought problems. Personally, I find that odd. Really bad depression & suicidal thoughts don't typically just disappear, in my experience... unless they were caused by some specific circumstance that is now gone.

If you truly no longer feel depressed or suicidal, then I would say no they are unlikely to be causing your anger now. The fact that you, at one time in the past, felt depressed & suicidal wouldn't cause you to be struggling with anger issues now, I don't believe. My perspective would be there is something going on with you currently that is causing you to have the anger issues you're experiencing.

The other possibility here, though, I suppose is that some of the tendency to be overly angry could have a genetic component and / or it could be something you learned from your parents. If you grew up in a home where the adults were always angry & arguing, I suppose it's possible you learned this behavior from them.

There is a sense in which, though, it doesn't really matter what the origin of your anger issues is. What's important is that your anger is hurting your relationships with your friends. So you need to learn anger management skills. This is where the possibility of therapy might come in. Also, there are professionals who specialize in providing anger management training. Depending on where you live, something like this may be available to you. (The courts will sometimes order a person to participate in anger management training, if he has ended up in front of a judge as a result of doing something illegal due to problems with anger management.)

One additional thought... have you thought about what provokes your anger? What are the situations you're in, or the topics of conversations you're having, that cause you to become angry? If you can begin to develop an understanding of what's typically going on when you become angry, you may be able to figure out some ways to "short-circuit" this "provocation-angry response loop". Keeping a journal, where you write about what was going on at times when you became overly angry, might be helpful.