Hello hwga, and Welcome!
My stepson has been in the hospital twice in alcohol withdrawal. The first time, he went through the DT's in the hospital. The second time, he tried to stop drinking on his own and his friends found him wandering the streets where he lives in full-blown DT's. They took him to the hospital.
The second time in the hospital, the social worker there was very helpful. That person will be able to help arrange a bed at an inpatient rehab facility - in cooperation with your boyfriend.
I add that last bit because, sadly, unless he wants to go, neither you or the social worker can force him. I just hope you can prepare yourself for that in case it happens.
Sending you hugs. I hope your boyfriend is truly ready to be done.