What is my best option for switching?

Methadone to subs question

I went from 3 momth daily 2 gram I'v user of fentdope to bupe for 7 days then switched to methadone after bupe forn7 days, dosed yesterday morning at 8am now so 24 hours. 20mg methadone. I could go to clinic rn and get upd to 30mg but I'm just prolonging this hell. With that being said i almost feeling the bupe was blocking some of the methadone but anyway about 7 days of methadone and I did skip 1 day and do fentdope (2gs) like 5 days ago. So twenty four hours ago, since my last Methadone dose, how long would I have to wait to start taking subs? I need help, I need advice, I'm going threw it physically and emotionally. Thank you, anybody and everybody who reads this, thank you.