I have been diagnosed with lymphocytic colitis and have severe butt , hip, and leg pains, is this normal?

Yes possible: Lymphocytic colitis also known as microscopic colitis , as to nacked eye colon looks normal has to be detected by microscope by lmphocytic infiltration in the mucosa, is associated severe watery diarrhea results in loss of electrolytes, especially potasium . It may be the cause of your muscle pains , check your k level, may need suplements. See your doctor.