Hi, did you developed the symptoms after stopping therapy with tizanidine or during tratment with tizanadine. Your symptoms are suggestive of hypertonia which is one of the withdrawl symptoms with this medicine as this drug may produce dependence.
Tizanadine is muscle relaxant, acting at the level of brain and usually given in cases of back pain, spasms etc. It is unlikely to have stroke with this drug. But its withdrawl can cause muscle spasm or hypertonia.
Relax and stop worrying about the symptoms but at the same time be watchful.