Mental health, where to start?

I think you should go and talk to your family doctor, you don't need to vent and whine to them. You can keep it pretty general and ask to be referred to a psychiatrist, if they ask you any questions answer as truthfully as you can. Its their job to try and help you, if they aren't helpful then ask for a second opinion from someone else at the practice. In my experience, the Psychs that you can just independently seek out are more expensive but if you want to pay more to bypass your GP then that's up to you. This isn't something that can be diagnosed by strangers online so do definitely go to a professional with your concerns.