29 with severe lower back pain,pain in my legs& my whole right side, had doppler test & no bloodclots were found in my legs.what else could be wrong?

Leg and back pain: It seems your are experiencing nerve compression in your lower back. Doppler and Ultrasound will not pick this up. You need a neurological work up. This can be done with a back specialist, neurologist, or pain management specialist.

Could be sciatica: have you seen orthopedist? stretching, physical therapy and sometimes cortisone shot at site of nerve insertion helps.