White spots under tongue, rough sore spots under tongue & back sides of tongue also on creases between cheek &gum. Very painful when I bit my cheek?

Unfortunately. These types of situations require a one on one clincial exam for a diagnosis and proper treatment. Merely listing some possibilities will be of no service to you. Schedule an appointment with a local dentist.
White spots. Oh so many possibilities. Need to be examined to be diagnosed. Expect to be asked when lesions were 1st noticed, have you had previous episodes, have you changed diet/meds/OTCs recently, when were your last Medical & dental exams, any systemic diseases/conditions? Start diagnostic evaluation process with your Dentist.