I stepped on my foot wrong and now i am in excruciatingly alot of pain, i can't walk on it properly,what should i do next?

Some questions first: Is there any color change that would suggest poor blood flow or a broken bone? Breaks usually trigger local bleeding that causes a bruise. Is there an obvious area of local swelling or does everything look normal ? A cool soak in iced water in the first hours can help some, as can elevating the foot above your heart level. However, you need to have this looked at if it interferes with function.

Foot Trauma: Not knowing much about your history, trauma, as described to the foot ought be evaluated by a doc. Several components, as mentioned in previous notes suggest, bone fracture, sprain or strain, vascular issues, nerve compression, and agree with other docs it would be wise to get this evaluated by your doc-

Be seen: If you are in “excruciating pain” as you say, you could have a serious injury. I would not hesitate to be seen for an accurate diagnosis. Some things can be quite benign while others may need intervention.