Need advice weening off of heroin with methadone

[Treedave]

I have been on a heroin run for about 3 months. Im up to a gram aday right now. Last month I went cold turkey twice with a small amount of methadone and felt no wd's but by day 3 I was using again. I went cold turkey last week and on day 2 I took 30mg of methadone but felt like I had the flu even after taking the dones. Right now I am weening down on my heroin use. Ive tried many times and just fell into using it all then buying more syndrome. Im doing better this time since Im running out of money so I have more incentive to quit. Yesterday I did my usual hit in the morning which is 1/3 a gram. Usually I do another at lunch then one at dinner but yesterday I just did the one in the morning. I didnt do any again til this morning 20 hrs after my last one. i was just starting to get that nasty anxiety feeling when I cured it. I bought another gram so I would have some for the next few days. I did break down and use a small amount this afternoon. Smaller then usual. I was already feeling the muscle and back pain. My plan for the next few days is to just do my morning shot so I can get through work and I am slowly reducing the amount of H in my system. I dont plan on using the dones till im sick and only if Im sick since I only have 20 of them. A big question I have is when I switch to dones will the heroin detox finish fairly unoticed and after a few days will I be able to very quickly ween off the methadone so as not to have done wd's. Also how much immodioum should I take to help the wd's. I have to take immodium regardless otherwise I keep waking up at night and having bad accidents requiring a shower if you get my drift but I am assuming for it to help with the wd's I will need to take more then prescribed by the label. I did a detox similiar to this but with oxys a few yrs back so I do know it can be done virtually painlessly but this will be my first time wd'ing from h so there might be differences. ALSO any advice how to deal with that awful anxious feeling. Its likje having an electric current in my chest and it drives me insane. Is there anything I can take or do that might help get through that feeling without going bonkers?