Last year I jumped off 5-7mg of methadone after tapering down from 30mg. I did it because I was in withdrawal at 5-7mg anyway, so it didn't make sense to me to take it any longer. The result was the worst withdrawal in my life lasting and lasting. After around 1.5 months I broke and started curing myself with codeine, eventually I was put on buprenorphine. It's definitely not a "stupid ass" drug, if it is, then it is the same way as all other opioids are. There are ups and downs about buprenorphine but it's much better than methadone, after a week on buprenorphine I started feeling "normal" for the first time in my life since I started taking opioids. With methadone I had to take two doses a day, with buprenorphine I take one dose and I could easily go without it for 2 days. I had to stop Suboxone a few times because of terrible constipation and 3 days after abrupt discontinuation of 8mg it was nowhere near as bad as methadone after 1 day. Buprenorphine doesn't make me high at all, it keeps withdrawal away and I feel as if I was sober.
I don't know why people abruptly quit buprenorphine. Being a partial agonist and exhibiting perceptible effects occupying a relatively small number of receptors, it actually lets receptors recover since they're not fired all the time to a large extent unlike with full agonists. As it slowly dissociates from opioid receptors, its long half-life doesn't go to waste and changes in dosing are hardly felt. Psychiatrists at maintenance programs should be better educated, that's for sure.
I know it's been 6 weeks, when it was 6 weeks since I had quit methadone, the last thing I wanted to do was taking methadone again. But if I were you, I would get back on the lowest dose possible so I don't freak out and so I could get my life straight. And when I felt ready, I would start tapering down. I've never taken loperamide at higher doses because 2-4mg was always enough to stop diarrhoea during withdrawal even after long binges at high doses of morphine. Being constipated by an opioid so much, basically all regular laxatives are of little use because none of them acts on opioid receptors, thus their action is conflicting with opioids action.