I keep having issues where i get a migraine and feel weak on one side ?

Complicated Migraine: What you are describing are migraines that are associated with focal weakness ..... Complicated migraines. You need therapy, would discuss with your neurologist, or if you don't have one, get one.

Hemiplegic migraine: These can be genetic and run in families or can be spontaneous. Migraine preventive medicines can make these less frequent. There are some specific medicines that seem to be especially helpful for hemiplegic migraine.