Hi BambiGrk.
Please take care of yourself. I lived a similar situation and I can relate to so many things in your post. My successful, loving husband also lived what you called a double life - he fell into IV drug addiction. My situation is a little different as my husband took his own life while grappling with several failed attempts at recovery.
I'm reaching out to you here as wow, I can relate. I just wanted you to know you are not alone. Yes, every grief and loss journey is different, yet there are those that can relate to the complications of addiction. For a long time, I was so angry. At him, at doctors, at society for judging, at death, at the pharmacy. I still call up some anger now and then and its been more than 6 years since he died. I told my therapist I didn't think I had a right to grieve, I didn't deserve sympathy, I literally wanted to die and I felt my life was literally destroyed.
Your feelings are your feelings, there are no shoulds, and anger can be a part of grief. Loving your husband and being angry can go hand in hand right now. Try not to tell yourself you should or should not feel a certain way. I wish it was as simple as 'letting it go.' Please take care of yourself. I am so sorry for the circumstances of your husband's death.
I am happy to share anything that may be of service to you.