Health - going from 400mg tramadol to morphine sr

[ravehat]

hi all
im a long term cfs/fms sufferer
the pain clinic have now moved me onto morphine sr (40mg) perday from 400mg of tramadol per day
so far all thats happened since the switch is withdrawal from tramadol and nothing from the morphine pain relief wise.
i had 70mgs yesterday and still felt nothing. at no time hav i felt any euthoric feelings or any other effect attributed to the drug.
could any1 give em some advice on correct comparable doses so i can go to the docs with some ideas (my doc and me dont have a great relationship but thats another story lol)
i am also prescribed 400mg of pregabalin and smoke weed.
thanks for any advice and any questions are welcome.
ravehat