I understand where you are coming from. I did the curl up in a ball and let the world pass you by part while my boyfriend went to rehab for 30 days for cocaine addiction.
I missed him so much I almost lost my job, I had no friends and I was alone. I went to an ALANON meeting in my area with a friends mother who introduced me to it. It helped so much just to get out of my self pitty for an hour.
He was clean for 1.5 yrs and just relapsed and well so did I. It is awful but this time it am here online doing this, going to meetings again and getting my head out of my arse!
He may come back and be done with you be prepared for that seeing as this time that is what is going on with me only he just left a 3 day detox and is still using. He came back the first time and when he did he asked me to go to meetings and to live my life with him in the house and seeing eachother and talking but things did change. He had to go to meetings daily to keep clean. They need to replace one addiction for something else. When he did this I was still a mess but we lived our lives on our paths and then we came together and it was okay.
Now is a different story and like I said as soon as he relapsed I did too. I think we both just forgot our steps and became comftorable and did not follow up.
Go to a meeting just sit there and listen to them. It helps and if nothing else you will get some really great hugs from people which always helps.
Good luck to you!