Here's a few more techniques:
1) Pick a word or phrase to use when you get a sudden, overwhelming feeling of depression or anxiety. As soon as you start to feel yourself becoming depressed or anxious, think about this word or phrase and just keep repeating it quietly to yourself. It can be anything you want, but it helps if it is a neutral or positive thought. It doesn't even have to make sense, it is just something you can focus on to keep your mind off your anxiety. If you like dogs, for instance, perhaps your word could be "puppy" and when you get anxious, just repeat the word "puppy" in your head.
2) Say "yes". In this technique, you find a positive question that you can answer "yes" to and then keep repeating "yes" in your head for about 1 minute.
3) Do you procrastinate a lot? If you have a task that you are avoiding, say "I'll just do it for a minute". Often, once we get started on a task, we'll keep doing it. It's just the dread of thinking about the entire task that keeps us from getting started. If you put off cleaning your home or apartment, break it down into small tasks and do it throughout the week instead of trying to get it all done on one day. For instance, one morning while you are getting ready for work, take 5 minutes and clean the sink. The next day, clean the toilet. A couple days later, clean the bathtub/shower. By the end of the week, the entire bathroom will have been cleaned. Do the same with each room.
4) Related to #3, do the next task. There is always some little task that we can do that takes virtually no effort. Pick up the book you left on the table and put it back on the shelf. Put your shoes away. If you've got a bunch of clothes lying around, pick up one shirt. Again, once you've done one task, it is a little easier to do the next.
5) If you have trouble remembering to use your anxiety strategies when you actually get anxious, try using some kind of talisman to remind you. Perhaps a necklace, a pen, a watch, a background on your phone, whatever. Just something to keep with you all of the time to remind you that you have the ability to use strategies to stop from feeling anxious or depressed. Whenever you practice your strategies, think about the object you use for your talisman, so when you see it, you'll associate the talisman with the strategy.
6) Whenever you are feeling anxious or depressed, ask yourself "what is wrong right now, this very second?". Most of the time, you will find you are worrying about something that is either in the past or in the future, but there is nothing wrong with you right at that exact moment.
7) Remember that your brain is listening. Don't beat yourself up. When you tell yourself that you are stupid, ugly, fat, etc., you are just making yourself feel worse and more self-conscious. For instance, if you are overweight, don't talk about your weight ever. If someone comments on your weight, whether good or bad, just say "I'm sorry, but I have a rule that I never discuss weight".
8 )If you have trouble getting up in the morning, picture someone else in a far away place getting up and starting their day. Then, picture them offering you a hand get up and get out of bed.
9) When you are in a bad mood, take some deep breaths. With every breath you exhale, picture your bad mood as being a dark, toxic cloud being exhaled and with every inhale, picture clean, fresh air filling your lungs.
10) Be a casual observer. Instead of getting caught up in your feelings, disassociate from them and act like a casual observer. Say to yourself "anxiety is happening", as if you were witnessing it in another person.