Suggest Treatment For Severe Leg Pain

Hello, Ive had deep pain in my legs for several months now. I dont do anything to cause it, it just suddenly starts. My legs hurt so bad its even hard to step up. The pain last for about a week and fades away. But the pain is coming more often now. Lately Ive been getting these huge bruises. Redish, purple, black. They show up out of nowhere. I can wake up with these huge bruises whereas the night before there wasnt anything there. Or nothing there of a morning and a huge bruise that afternoon. The bruises do not hurt at all.