Just a drug related question!

For 3yrs I've had bad back probs after a fall on ice my gp blames MS and says my nurse should send me for a scan, my nurse and neurologist say my gp should send me for a scan as i had a fall🤦‍♀️. Finally changed my nurse who's wonderful and she has referred me for a scan and demanded my gp helps me out.... MY QUESTION- my gp has put me on tramadol (as no other pain killer has worked) it stops the pain for 6/7hrs but it returns with a vengeance after and as I only have 30 tablets i am trying to space em out so they last as long as poss. Has anyone had any problems from taking them in relation to pains/fatigue frm MS? AND has anyone been on them for a long time? Cheers X