Suggest Treatment For Dizziness And Sweating Due To Low Blood Pressure

Hi, For the last 3 years I have been having serious pains in my saecrum and hip which comes and goes. At first it started as a sharp stabbing pain which came while I was routinely walking or bending over. The pain originated in my lower back but affected my abdominal area in a belt like manner and it would cause me to get dizzy and black out. In 2011 I went to the GP, and he ran blood tests, urine tests and found nothing abnormal. He told me to up my iron intake (although there wasn t a deficiency) and diagnosed it as sciata pain. In 2012 it returned while I was studying in England. Again, they ran blood and urine tests and found nothing abnormal except for low blood pressure which I ve always seem to have. The doctor explained that it was common for people dizziness to occur when changing position and posture especially among individuals who are tall (I m 6ft). Again they told me it was sciata related. Well it has again resurfaced. I went to the General Hospital this time and they ran a urine test and the nurse said it showed trace levels of protein and keytones. When I asked the doctor what it means he dismissed it saying it was nothing. I am not diabetic and I have never had a problem with diabetes. This time they had me do an xray, the results and specialist report for which i m awaiting. Should I be terribly worried about the proteinuria and keytones? Could increased intake of biotin and msm cause these side effects? I normally take biotin for hair health and glucosamine chondroitin msm for joint care since 2012. What can I do about the low blood pressure which often has me faint, dizzy and cold sweating? Since childhood I suffer from severe hyperhidrosis, could this be a factor when it comes to my blood pressure? Forgive me for being so lengthy, I just wanted to be thorough. Please advise.