Hugs, I am sorry to hear that you are having such a rough time.
To be honest, there is no reason to take his bottles away just yet. I know that both doctors and HV suggest trying to get rid of the bottles by the time your lo is 1, but a lot of lo's that age still have the sucking reflex that they are craving. As long as they have gotten rid of their bottles by the time they are 2 that is usually the away to go.
I tired to take my DS off his bottles when he turned 1 and there was just no way he was interested. I tried again at about 14 / 15 months. His milk intake did go down quite a bit, but was still drinking juice / water out of his sippy, so I upped the amount of milk I put in his cereal as well as his yogurts etc.
It is only recently that he has started taking milk in his sippy and is drinking it like a pro now and is constantly asking for more.
I would persever offering him the sippy during the day to get him to practice with it and once he starts taking more, you can up the amount you put in the sippy.
I would not worry too much at this stage, but just keep persevering, he will take to it in the end.
HTH's
Paula