Yes, I have been there and I experience many symptoms daily. You are not crazy, though you may feel that at times. MS is not fatal. It does, however, slow you down.
You may need to make lifestyle changes. I have endured my MS (med-free) for at least 30 years from when my first symptoms appeared. I have learned to listen to my body and learn my triggers. Triggers are those things which can cause flare-up's. For me, some of my triggers are temperature, lack of rest, etc. You need to discover your own triggers.
For me, when I have cognitive problems, I rest my mind. I read and study to keep my mind exercised. I also stretch my muscles as well as use a passive exercise machine. Though I am not well as I once was, I live one day at a time.
Set goals for yourself which are obtainable. As you progress, make the goal a little harder, but do not blame yourself if you can not accomplish what you want. Be proud of being able to accomplish what you can.
I know that without my personal journey with my Creator, I would be lost. Each day I know that I am blessed.
I truly hope you have something which is treatable, but should you have MS, keep coming here to be among your fellow MS gals and guys. In the meanwhile, I will keep you in my prayers.