I’m glad that you know what went wrong that time. You did great going through all New Year’s Eve etc and resisting any temptations. I know how easy it is for someone to blame any occasion as an excuse to do it.
The urges sound so strong, I’m amazed by now they haven’t came up with any kind of medication that can be given to someone to overcome these urges.
You should be proud all the work your putting in.
I forgot about the shared accommodation, maybe for now you could start small grow some basil or oregano, tomato plant on a window ledge. Gardening can be very calming and healing.