What Causes Severe Depression Along With Heaviness In Legs?

Hello Dr., I feel so sad, all of the sudden during the dqy I Just start crying for so many reasons, very tire, I feel like am drunk, my legs are very heavy, I cry so hard, from deep inside, remembering things I didn t do when I had the chance, at time my vision is very poor, some times like right now I find myself making all kinds of mistakes when I type, and that make so mad, I hate myself, I hit my self sometimes, I loose things, things that I Just had in my hands, I have no patience