hello Ria. i'm very sorry but i really don't know what to suggest as far as drugs go. i actually refused to take Plaquenil because i was afraid of the side-effects.
Could i just go off on a lateral vein and express my frustration that we don't know the causes of this thing, and the reasons why sometimes the symptoms abate seemingly of their own accord. i just mention it because that is what happened in my case. i reached a certain plateau and aside from the swallowing problem, i don't seem to have gotten much worse for a while. and i keep casting my mind back to the early days and two points;
1. they thought i got DM because of stress
2. one doc had me tested for allergies
i just can't help feeling that there is some enviromnmental component to all this, that there is SOMETHING we are living with or eating or going through that is causing or aggravating the symptoms.
well i found that i was allergic to egg white and dust mites, and i tried to eliminate both. i've also made sure there are no pesticides around my house, like fly spray, and no weed-killers. and i try not to eat food with a lot of preservatives or other artificial additives. and a relationship that was making me feel so desperate i occasionally felt suicidal finally cracked apart.
and my symptoms have not progressed so far as your mum's even after 9 years. i guess i am probably at least her age.
perhaps some changes in life style may be of help... a move to the remote, quiet countryside for a while maybe....i know it seems like a very long shot, and i wish i could suggest more!
i wish you all the very best