My husband is having very severe lower back pain mostly on the left side. This has lasted for the last two days. he also is having infrequent shaking spells that last only a few moments, but causes him to feel like he needs to urinate. The shaking is all over his body, but when it's over, he feels fine, except the need to urinate. He saw his family doctor in JANUARY, and had complete blood work completed at that time, all results were very good and normal. Any idea?