The short answer is none of us can tell you if it's a good idea or not Sara. You know your dad better than anyone here.
You might get help with money for rehab, you may not - I wish you luck with that.
I think it's dangerous tho to expect you'll get a dad who'll drop everything and run to your side and hug you and tell you everythings gonna be alright.
It will be great if that happens, and you have a right to want that - but many of us didn't and don't have that, and that just is what it is.
In the end, family support or not, money or not, we owe it to ourselves to get through this, and many of us have - you can do it too.
D