You are emotional when you trade and as such will never succeed in your current setting.
For you to have any chance being successful OR for you to stop investing you simply have to stop caring about whether a share price goes up or down. You have NO DIRECT RESULTS on the movement of the share price. All you can do is influence how well reasoned your decision is.
A well reasoned decision that still makes a loss or ends negatively should still be looked at as a success. Conversely a poor decision that luckily yielded a win is still a poor decision.
The fact that you allow yourself to get so riveted and emotionally sucked in is probably both the reason you lose money AND the reason you become addicted.
A good idea would be find another outlet that allows you to feel the emotional highs and lows, this would most likely free you from the shackles of investing OR if you chose to continue investing would ensure that your investment decisions were based on reason not emotion.
The best advice I could give, however, would be get a referral from your GP to a clinical psychologist and discuss your issues with them. While it's a unique addiction, most addictions boil down to the same principles. Having a trained professional assist in this situation is ideal.
