What do you think these symptoms mean? Am I being a hypochondriac?

O.k. Let me preface this by saying my mom has multiple sclerosis, and has been dealing with it since her early-mid 20′s. Recently she had some problems with her MS, so I started to research it, and what I found made me think. These are my symptoms: I was diagnosed with depression a while ago, and am on medication for it; I feel very very fatigued, like my limbs are weak with even the smallest effort; I feel SO tired all the time, especially from just after lunch to like 6 or 7, to the point I skip things I would normally do, even things I like because I’m just too tired; I twitch alot randomly, but not painful; when I am really tired or stressed, one of my eyelids opens wide, while the other droops, again not painful; For the past 2 months, I have been extremely constipated; the other day, my left eye started hurting, Not like anything was in it, it just hurt. Am I over reacting just because I know it runs in my family, or should I seriously think about getting an MRI?