A few days ago i tried to avoid stepping on a plug and hurt my big toe doing so.i have a mild limp on that foot , toe hurts on the side. what to do?

Have it checked: Sounds like you injured it and unless it's examined it's hard to say whether it is in the soft tissue, the bone or the joint. See the podiatrist!

Toe injury : There could a few types of injuries that could have occurred. The most likely injury that you are expressing is a tendon or capsule injury. Most of the time these are self limiting and will dissipate in a few days, if they continue i would see your foot and ankle specialist. They can take an x-ray and or do un ultrasound to check the bones, capsule and ligaments to see if something is more serious.