I think a lot of us have been through depression or anxiety and at some point and felt the way you did. In my case several things help me get over my situation. The first thing is to try not to be alone. Surround yourself with people you love or that are positive and happy. Next was meditating in my situation compare to others who might be in a worse situation, for example with some type of chronical condition or having no food or place to live in. And finally being thankful to God for the good things you have in life for example health, a job to maintain a decent living, a family, a beautiful earth to live in and other things you might not notice that are a blessing to have. In other words having a spiritual need can bring happiness to ones life. A lot of the questions we think we don't have an answer to can all be found in the Bible. People think to look at the Bible just as a spiritual book but it also contains a lot of practical advice about dealing with anxieties and normal everyday problems. People all over the world have found happiness from reading and studying the Bible regardless of their emotional or physical situation. I hope you can get over your situation but know this, it is easier to deal with a problem when you know you have the most powerful being in the universe backing you up. Please take the time and browse this website when you get a chance jw.org and you can find the answer to the questiom you posted about why keep living?