Good for you, Aylish. You're on the right track. Take the 3 mg for awhile and then try 4.5...Alot of people do their best at 3, when my son tries to increase to the 4.5 he gets an incredible amount of stiffness in his legs and torso and suffers severe insomnia, and it is uncomfortable enough that he has to drop back down. Although the optimum dosage for MS is listed at 4.5, I'm willing to bet that half the people using LDN are at 3 mg. I even know of a couple of people taking only 1.5, although that is thought to be of no benefit.
As far as seeing improvements, everyone doesn't. But, you also say that your MS is "mild" so if you don't see any problems or progression, you're accomplishing what you want to accomplish. My son was lucky in that he saw several improvements. Everyone doesn't. He had some residual damage left from early attacks that improved greatly. His fatigue, depression and heat intolerance also disappeared. But what we are mainly thankful for is how well he is doing overall on the LDN, and the fact that we haven't seen any progression since he started. He also experienced NO side effects from LDN when he started it, so you two are very lucky, although most say the insomnia is mild and transient.
One other thought...You might monkey around a bit with the time you take it to see if you get more benefits. Colby is 16, and he's not real consistent with his time, but has noticed that he feels his 'best' the next day if he takes it around 10...Alot of other people say that taking it at different times makes a difference for them, so you might stagger it here and there a bit, just no earlier than 9 p.m...
Please keep us posted! We're all in this together!