Welcome,
I'm not sure what dosage you were using but i have gone cold turkey off of methadone after taking 30-40 mgs. Daily
The worst symptoms peak around a week and hang on for about 2 weeks.
Not trying to scare you or anything and you are not pathetic.
I also started taking mine sharing with a relative who gave it to me for cravings. Neither one of us had any idea what i was getting into.... i had just got out of a 30 rehab for vicodin addiction.
If there is any way you could see a doctor and be tapered off, it would make things easier.
But like i said, it also depends on how much you took a day.
I wish you the best!! :