I am a 29 year old female in good health as far as I know. I have a 9 month old baby, which is relevant to all of this (keep reading). About 3 months ago, seemingly out of nowhere I started having pain that ran from my shoulder blade all the way down my arm (just the "top" muscles, tricep and upper forearm). It was a muscular pain, not a burning like nerves. The two days prior, I had been sitting at the kitchen table at my computer, holding my very wiggly baby with my right arm as I tried to check email periodically throughout the day (he didn't want to be put down). After two days of that, that's when this started. When I'd lift my arm, it felt like I'd injured it somehow right along my deltoid muscle. I figured I must have done something my body didn't like and that it would get better.
A few days later, it was still ongoing and suddenly the muscles in my back between shoulder blade and spine got SUPER tight (not spasming, just tight) and then my entire right arm tightened up. Anytime I'd do anything at all with that arm (something as simple as cleaning out the bottles), my arm would feel fatigued very easily and tighten up further. My strength was always fine, but my arm FELT weak if that makes sense. I tried exercising (pilates) thinking maybe I was just really out of shape and afterward my arm was shaking out of control for a little while. But I could still do everything I needed to do with it, including hold my baby. It would just feel fatigued easily.
This went on for a month, so I went to see my doctor. She tested for Lyme's, did a full CBC, checked ANA antibodies, vitamin/mineral tests - all were normal. She recommended physical therapy before doing any other tests (MRIs, etc), but said if it doesn't help we'd have to think about MS
Flash forward to now. I've been in PT for 2 months now. My therapist believes that it's postural, that holding my baby hunched forward for a long time (he didn't want to sleep anywhere but in my arms for the first 4 months of life) weakened my stabilizing muscles in my shoulder area. She said the muscles in my right arm (I'm right handed) likely had to compensate for decreased strength/vague injury to the shoulder area and it was a domino effect.
After a few weeks, I started improving slightly. My symptoms would only occur with movement. At rest it was like nothing was wrong, no more pain down my arm or anything. But I would have it anytime I would do anything with that arm. I started noticing HUGE improvements 3-4 weeks ago after starting strengthening exercises. It takes a lot more to irritate my arm now and if it does get irritated, it doesn't stick with me all day like it did before. But I'm still having mild-ish symptoms with movement only. Never had any numbness, tingling, vision changes, balance problems, etc. Just this arm thing, easily fatigued muscles.
My question is, does MS present this way? It's been 2 months of PT (3 months since symptoms onset) and I'm still not symptom free. There was no obvious injury or anything we can point to. I've always suffered greatly with hypochondria and anxiety and I'm SO worried that this would be MS
((( Please, can anyone shed light on this for me? Does this sound like MS?