Hi Loryna and welcome,
It's possible your experiencing sensory side effects from the Copaxone but with MS it's just as possible for you to be experiencing another relapse.
The general rule of thumb with potential relapses is to contact your neuro IF you experience something new 'and or' your previously remitted symptoms return 'and or' your everyday symptoms worsen for a period no less than 24-48 hours, and when your last relapse ended at least a month or more ago.
You've been experiencing this for 2 weeks now, and I would definitely recommend you consider contacting your neuro and also consider discussing the symptom treatments that may help give you some relief.
Hope that helps.......JJ