I know the feeling. I quit from time to time for various reasons. This last time I quit for a year and only just recently started smoking pot again, but I feel that this will be short lived. I do enjoy smoking weed and would definitely consider myself a functional stoner. It never really got in the way of anything in my life, per se. For me it was about finding some clarity and moderation.
I don't think it's an addiction more than it is just sheer habit. Being a stoner is a lifestyle. You have all your stoner gear for the lifestyle, pipes, papers, grinders, trays, bongs and all the rest. I always kept that stuff in a box someplace when I quit, full well knowing that I should just get rid of it all. There it all sits, waiting for the stoner to return. I think I will always be a stoner at heart. I quit struggling with it. I smoke when I want and like I mentioned, quit when I want. I totally see myself as an old man sparking up a joint on my death bed.
Quitting is hard. The withdrawals from weed can be pretty intense and difficult to navigate. I think it always takes me about 2 weeks before I start to feel ok. I completely understand what you are experiencing quitting.
I think it's great that you made this commitment and I wish you success. More than happy to support you!
YOU CAN DO IT!!