I think i may have broken my metatarsal because it is extremely swollen and bruised. what should i do for the quickest recovery? or how can i determine if i should see a doctor is i can slightly walk on it

See a podiatrist: Not being able to walk on a broken bone is a fallacy. If your forefoot is swollen, bruised and painful with point tenderness over a metatarsal, it's likely broken. Like any other broken bone, it should be x-rayed to determine if it is aligned properly and then immobilized in proper alignment. It will be ~75% healed in 6-8 weeks provided you don't do anything to delay healing.