What is the path to getting diagnosed and treated for depression?

31/m - LV, NV

I’ve had untreated depression for the majority of the past 6 years. On and off, but mostly on. I used to believe I could find a way to overcome it, but now I really believe I need to be properly diagnosed and possibly medicated to help curve the lows that I can feel for months on end

I have a shit job but that should be changing, but it makes it hard to schedule anything with a professional because I’m under the assumption it’ll be very costly.

Just need some advice on where to go from here to finally manage these negative thoughts and overwhelming self esteem issues.