G8R, I wish I knew what to tell you, but I don't anything about Sub. I also have read alot of post about the Sub wd . Have you talked to you Dr. about it and your fears. I just wanted to reply and let you know I am thinking about you and praying for you. I have been addicted to Hydros for over 10yrs and this is my 4rth day without them and it is ruff, I wanted to try Sub, but had no insurance and I found out it is very expensive. May God bless, I wish I could help, sorry. LOL, Fiesty2 PS, keep posting I know someone will surely have some advice.