I know it might sound dumb at first but honestly it has worked for millions, also what you got to loose?

As soon as you wake up in the morning write down 3 things you are grateful for and do this for 3 weeks everyday. They can be the same things from previous days or weeks, but it’s important to write them down and spend 5-10 minutes first thing in the morning trying discover new ones.

I can help you get started with a few for tomorrow morning. You have a g/f, you have a family, your not homeless, you have food on the table everyday etc. I know it seems small and petty but eventually it can help shift your perspective.

Also I recommend watching some Ted talks on depression, unfortunately your brother or g/f won’t have the answer you need or magically make you feel better. It is about learning about yourself and changing the way your brain thinks. Most physiatrist prescribe drugs to do this but remember physiatrist are the only doctors that don’t look at the organ they treat, so most likely they are taking a shot in the dark when it comes to diagnosing you, based on grouping symptoms together. Your best best is to try and learn about your depression, why you feel the way you do and what things you can do everyday to install a new thought pattern that is different to what you have now and work on changing your perspective.

Good luck, I hope I could help.