Sorry to hear that you have had to deal with all of this too, Swatgen!
My mum like you, has had issues with getting my medications (I'm not able to get my own as I am under 16 years of age)! I have to take Ketamine when I am in a really bad RSD flare as it is the only thing that helps lower my pain and the Pharmacists look at us as if we are drug addicts and refuse to give me my medication. Unfortunatley, Ketamine is used by a lot of young people over here in the UK illegaly as a drug and the pharmacists seem to think that that is why I have to take it despite me having a letter from my Pain Management Doctor, copies of all of my medical notes etc.
A few months ago, I was in a severe flare and the Pharmacists wouldn't give me my medications so we had to wait a week and get it from my Pain Management Doctor. Thankfully, I only take the Ketamine when I am in a severe flare otherwise, I would have had lots of withdrawal symptoms from it! We now get my meds from my childrens hospital ... it's an hour away but it saves all of the arguments with the Pharmacy!!
I really hate how people just seem to think that anyone who takes a certain type of drug, is a drug addict without realising that they are used for many other illnesses. Yes theres drug addicts out there, but theres also genuine people like us who hate taking the meds but have to to try and function in normal day to day life!!!!
I hope you get all of this resolved. Try and speak to your prescribing Doctor and see if he/she can do anything to help.
Take care!