Become aware of what triggers those negative emotions then dispute them. ABCDE.
ABCDE? Could you refresh my memory on this?
Peace,
G,
Its from "Learned Optimism." It basically stands for a process that you go through when you are depressed/angry, whatever. The gist of it is you search for the trigger that's causing your reaction, and I mean the base of it - it's usually a belief you have.
Once you identify the belief/thought that's the trigger, you question whether it is a reasonable belief/thought. 99.9% of the time, it is unreasonable (e.g., "I'll never find someone again.").
Then flip the thought/belief around to a reasonable one (e.g., "It may take some time, but the chances of me being alone the rest of my life are slim. And even if I am, I won't be lonely.").
Change your thoughts and your emotions will follow. Not the other way around.