Meprozine and mepergan

Ive been on meprozine or just plain demerol for 5 years now i do not take more then 1 pill in 24hr and then i try to put days in between doses i have OI a brittle bones and kidney stones and this is the only pain medication period that i can take with out having a bad reaction. as far as mood swings i don't have any if any thing it keeps me calm but it will only stop the pain if you take it on the first on set, if you wait and take it till the pain has gotten worse it simply wont work at all. there is one side effect it keeps me awake lol im the only person i know who can take this and stay a wake all night