Unhappy

Hi
Yes I am new to this post , actually new to any post ...
But this is my story ..... I have 2 sons , one son gives me no problems , and doing very well , engaged to a lovely girl , had own company etc he is 23 ......
On the other hand I have my 20 yr old , which gives me only grief , I know that's awful to say ....
From the age of 13 has started to smoke pot , became addicted from day dot ... Expelled in year 7 ... Managed to make it through to year 9 , got an apprenticeship , then got asked to leave tafe ... Couldn't manage at work , all the while still smoking pot ... Got drug induced psychosis , hospitalised , since then has been in hospital 3 more times ... Has a monthly injection now plus oral meds ... Has done 2 short rehabs in the private hospital ... At the moment seems to be drug free (maybe 2 weeks ) ... Also has abused his oral meds , and who only knows what else .... He now is 20 , and is left with severe mood swings , poor concentration , no life skills ..,. Has good and bad days .... Needless to say my marriage is on the rocks , my husband which is the boys stepdad has had enough .., there is an avo here , so he can't live here ... He is couch surfing with a few relatives , his dad won't take him .... I have tried to get him into residential housing, it teaches them life's day to day skills , he made it through 3/4 app then walks out ... This child had stolen from us , destroyed our property in one of his tantrums , bought drugs into our home ..., we have had police here on a number of occasions .... But still it is my son ...... And he only wants to come back home .... How awful , I have my husband who won't bugge and even hear of him coming back, we have a granny flat , vacant , if I even mention that , he goes off in a rage ...I have my son throwing tantrums and wants to come back .... Tonight I am not speaking to either of them ...... I just feel so down and out ...., maybe I might have to leave, not sure , ... The stress of my son not having a place to stay is consuming me .... Well that's it in a nutshell .....