Hi Toria ,
It may not be a mild stroke since a stroke can be diagnosed by an MRI and a stroke has associated nervous system symptoms like vertigo , slurred speech , double vision and others .There are various other causes of muscle weakness on one side of the body . They are muscle stimulation disorders , peripheral nerve disorders , nerve impingement in the spine . Did you go for an MRI spine with contrast ? Please go for EMG and nerve conduction study on the affected side along with MRI spine if not already done . Please consult an orthopaedic surgeon and neurologist for the diagnosis and treatment . Hope this helps you . Take care and regards !