>>2That works more for intrusive thoughts. It won't help much with depression (although for some people, it can help put them in the right direction that negative thoughts shouldn't be listened to). I know it has helped with my intrusive thoughts. It's a good thing to at least try out.
>>3 This is supposed to be self-advice (advice that worked for you, so you are sharing with others) so for Sofa, it did indeed help. What works for some people won't work for others. Sometimes things that seem childish will be very helpful to some.
Anyways, my advice? Breathing exercises work wonders. I always thought they were bullshit, but I started using them and wow, they helped with anxiety a bunch.
One method that works well for me is to count down from 10 while taking deep breathes. Once you reach 0,just do the thing you're anxious about doing, don't think about it. I've been able to talk to professors by doing that.