You're going to take that first step, by going to the GP tomorrow, and try and grab as much help as is on offer to you. As long as you take the first step, there should be support to you. Just booking that appointment, and speaking honestly to your GP is a great thing for you to have managed.
There's no magic bullets for dealing with depressive periods - you just have to ride through the worst bits in the best way you can, and look through to happier times ahead. alcohol doesn't work, as it depresses you further afterwards.