magensuim infusions

Hi I am a 51 yr gal who had a j- bypass some 20 odd years ago...As my health has deteriorated in the last 10 years and more in the last 4 years I have found through my fibromyalgia specialist that I have very low magnesium (oral does not work)...and that magnesium infusions would be beneficial...but he and I can not find a doctor to prescribe the dosage needed...the only one he knows is not taking new patients... My local GP will write the RX and the local hospital will do the infusions...but the dosage is a problem...Does anyone know of a doctor in the lower mainland of British Columbia that would be able to assist with this process... From the research that I have done...alot of my symptoms would lesson with the infusions and perhaps lessen the need for a revision... Thanks Bonnie