911!!! NEED SOME DRUG ADVICE? ANYONE KNOW ABOUT HEROIN ADDICTION?

I recently posted the following question and got alot of opinions but no knowledge pertaining to the drug…PLEASE HELP ME!
My husband just recently admited to having a several year secret addiction to heroin-which would explain our maritial problems and separation. He claims he only smokes it and ” hates needles”- yet- three weeks ago- he claims he quit when he was sent to jail for a week on another charge. BUT- since he has been out- He first appeared sweaty and sick- like withdrawls but now- he is not sweating except alot in his sleep- he is hallucinating BIGTIME in his sleep and his speech seems slurred and quieter than usual. And his voice seems higher pitched and strained. Marijuana seems to make him WAY more messed up than ever before. Hie pupils are non-existant( could that be caused from anything else?- his eyes are rolling and scattered and his skin seems kinda ashy again. Last week, he pointed out three syringes and some tin foil in my yard- mind you- I live in Beverly HIlls and have never have never seen drugs in my yard- after he left, they never appeared again.Could him showing me this be his cry for help? Even though he claims they werent his? How do I know if he is still on it? Is there a difference in behavior between shooting it and smoking it? I feel so uneducated and he is refusing to be honest and claims he has been sober for a month now- but how long do the withdrawl effects last? And do your pupils shrink and eyes appear more blue during withdrawl or only while using? Do other drugs cause this small pupil effect too?, Also- if he was taking a pill substitute-would that still show up on a home drug test? so I thought maybe someone could shed some light on this for me? Thanks!