Disclaimer: I am not a medical physician. If you find yourself in any of these situations or feelings, please seek medical help.
Treatments: Though there are many ways to actually seek treatment the most common are medication, exercises, and counseling.
Coping Mechanisms: Yoga, and exercise are going to be your best bet. Truthfully doing things that you enjoy and love will also help you. I personally use cleaning to assist in helping me cope with my downfalls in the day.

The bottles above are antidepressants
Different Common Medications For Depression: Abilify , Adapin, Anafranil, Aplenzin,Asendin.
(https://www.webmd.com/depression/guide/depression-medications-antidepressants) Follow link to view Wall Street Journal video. https://www.wsj.com/video/the-hunt-for-faster-antidepressants/AB0B80A2-1043-4770-A02E-C06BB22C4A5C.html
(https://www.wsj.com/articles/SB10001424127887323735604578438630609758320)
Common Medications for Anxiety: Citalopram, escitalopram, Fluoxetine, paroxetine, sertrailine. (https://www.webmd.com/anxiety-panic/guide/understanding-anxiety-treatment#1)