I fell and either injured a rib or pulled a muscle on my right side. The pain has increased over the four days since the injury, and I started experiencing what I believe are muscle spasms in the affected area. In that time I have taken a generic flexeril twice, as I have it on hand, and a generic tylenol twice (two extra strength capsules). I cannot take ibuprofen because of a hiatal hernia that will bleed out. I am trying to take deep breaths, and (painfully) succeeding. I know my doctor can t fix the problem, that it heals in time; I just don t want to overlook any serious warning signs.