ADHD

Perhaps this is the totally wrong place to ask this. I have not quite been diagnosed with ADHD yet. I actually have Multiple Sclerosis with a lot of cognitive problems. In fact one neuropsych report said the testing showed some ADD. Is it possible to have ADD that was mild enough to go undiscovered all my life until my MS cognitive problems caused the ADD to come to the forefront? I am no longer married but in a relationship now. Thoughts on this?