I wish I had a recommendation for a doctor familiar with tech startups. It could be tough to find that. Have you considered looking at your diet too? Also, networking with other tech founders is helpful. As one myself, I started getting really isolated and it threw me into a depressed state. I started by making myself go to one event each week that was startup related. A lot of us experience what you're experiencing and knowing that its common (and that you're not alone) can really ease the intensity of the symptoms. I wish you a lot of luck. Also, if you wanted to connect, feel free to email me and I'm happy to chat. I hate to see someone go through depression alone.