Don't go cold turkey. Your sons needs fluid and calories and since it has been four weeks since you we breastfeeding him, your supply will have diminished too much.
It is important that this is not a battle for you both. Rather than trying to get him to latch on at times when he is screaming with hunger, start with plenty of relaxed skin to skin contact. This can be when you are in the bath together, laying in bed together, etc. If you don't have other children to look after, try to dedicate yourself to this for the next few days.
When you are both relaxed and he is enjoying the skin to skin cuddles, get him as near to your breast as possible. If he is willing to have a little suckle, then great.
In the meantime, you need to start expressing to get your supply back up. I know the conventional wisdom is that he needs to feed frmo you frequently to get supply up, but if getting him to latch on is making him scream the place down, it is counter productive.
Start expressing at least the same number of times (and roughly same time of day) as he is having bottle feeds. More often if possible. Latch him on when he is relaxed and not starving.
The reason he is screaming and fighting you is two fold. He is not gettng much (if any) milk when he latches on so why would he want to continue? And he is now used to the bottle as his source of food.
If he starts to latch on more happily and without a fight, start latching him on after he has fed from the bottle and is happy. You are aiming to have him feed frmo you first before a bottle feed at each and every feed. But you need a few steps to get to this.
Once you feel like your supply is back up from the expressing and latching on sessions, you can start to feed him solely frmo your breast and no bottle. But you may need to feed more frequently initially than when he was just having a bottle.
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