Hi Nausicaa. I have RLS symptoms too. In my case it's a side effect of an antidepressant I'm on. I am prescribed Clonidine, which provides a fair amount of relief for me. There are several drugs like it that may treat RLS but it can be very hit and miss. RLS is often hard to treat but if it is caused by insulin then there may be things you can do to fix it.
I am starting on insulin soon, so I can't comment on that side of it. I'm sure those with experience with insulin will help you out. Good luck.