Lord yes. :)
Constipation and methadone go hand in hand (just like diarrhea and withdrawing). Take a stool softener...no fiber! At least, it won't help.
I hate to get specificially yucky, but pick up one of those "fleet enema" kits. If very bad, you can have issues with tearing and hemorrhoids.
As to urinating and blurry vision...I'd say your dose is too high. Any opiate can cause the body to be to relaxed so you can't contract the muscles to urinate.
I don't know much about that medicine, but there are people on here that do..Just keep checking sometimes it's slow here but someone will help you.
Hang in there!!!
bobby