I am so very sorry you have received a diagnosis of MS.
Before and during my diagnostic process I had numerous symptoms. My mobility was severely effected, I could barely walk. When my Neurologist gave me the diagnosis of MS he told me the best thing I could do is walk. He saw the look on my face
and told me, "I know your walking has diminished but walking will help."
My walking initially consisted of taking multiple walks within my home. After a bit (1 or 2 weeks) I ventured out side and walked half way up the driveway and back. It took quite some time to go any distance but oh so slowly I was able to. After each attempt to walk/extend my walking I would come back in the house immediately sit down before I fell down. I would be exhausted, weak, cry and then sleep. I kept trying and little by little I did see improvement. It took me a year to regain my mobility. I could walk 2 miles, that was my limit. On bad days my limit was less.
For right now stop trying to do the activities (volleyball, etc.) that you have always done. Start with baby steps and gradually increase. With time I would hope you see improvement.
Multiple Sclerosis is a disease of the Central Nervous System(CNS) which includes the brain, spinal cord and optic nerves. The CNS is our internal wiring that tells our body to do certain things. MS causes scaring (Sclerosis) along our wiring (CNS) which causes miscommunication.
Think of an electrical cord for a lamp. When the electrical cord is in good condition your lamp goes on and off without a problem. If the lamp cord is frayed your lamp may turn on/off or it might not. This is just a simplified way of explaining what happens in MS, although MS is much more complicated.
Steroids are to calm the inflammation and possibly shorten an exacerbation (relapse, attack, flare-up). Sometimes, such as in the case of mobility being effected there needs to be more intervention such as what I explained I did, working with a Physical Therapist, and a combination of rest and mild/gentle exercise. Time and patience is needed.
Diagnosed with Multiple Sclerosis in 1985
PTSD diagnosed Feb 2004 (PTSD since age 2), Anxiety/Panic attacks secondary to PTSD.