Rehab is the initial part of treatment and is about getting the person away from the substance they are abusing. Only after the person is free from the substance can medications and therapy begin. Often medication and therapy begin in rehab then and continue after the person has been discharged.
But yeah, I hear you and I've thought that too--that being away from the everyday pressures, to feel taken care of, would make a big difference and especially if someone has meds to get used to. Many do spend time inpatient for stabilization or they go to partial hospitalization. Have you asked about doing this?
Can you take some time off work and at the same time increase the frequency of your therapy, kind of a do-it-yourself approach to wanting an esacpe for a while to work on you?
I also think we sometimes want a quicker fix. We really do want to feel better.
It takes time; it's a process.