Im sorry to hear about your symptoms. Now a sore shoulder with pain radiating to the arm alone is NOT an indication that you have MS. This sort of pain can be due to a number of conditions, the first one which comes to mind is that you could have a problem with the nerves in the neck. COmpression of nerves in the neck due to a disc prolapse or even arthritis in the neck can lead to pain radiating into the shoulder and the arm. This can cause numbness, tingling as well. the diagnosis is made with the help of a simple xray of the neck as well as a NCS/EMG test. the treatment can be with painkillers, drugs like lyrica and even steroid injections into the neck.
Another cause of this can be related to a shoulder problem. Shoulder tendinitis which is inflammation of the tendons in the shoulder can lead to this problem. MRI of the shoulder can be diagnostic. Similarly if your movement is restricted in teh shoulder, frozen shoulder can be considered as a cause for this as well. Now i would suggest that you start using OTC painkillers like motrin(ibuprofen), aleve (naproxen) and apply topical voltaren gel on it. Application of ice would also be helpful.
But regarding MS , it is unlikely to be MS as it usually also cause numbness and weakness in the legs, blurring of vision, back pain, muscle aches and paralysis. Your other symptoms also can be explained by anxiety as well as electrolyte imbalances or even simple dehydration. None of these sound like MS. But i would suggest that you do see your doctor for the shoulder pain.
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