Suggest Medication For Tremors In Body And Lower Back Pain

I am 31 male and I have had a list of issues. It started with lower back pain and has went in to my legs and spread to the middle back. I also have trouble going to the bathroom. I can eat whatever I want and will not gain weight, if I eat low fat I lose weight quickly. My newest issue is I whole body termors. I have had all kinds of blood work CT of my belly, prostate check, EEG and they all show me to be fine. Yet I can not do even half of what was normal for me. This started over a year agao and just slowly gets worse. I thought it could be lupus yet the blood work came back fine. PLEASE ANY IDEAS OR HELP is welcomed and needed.