Sprained ankle almost two weeks ago. when can i put my full weight on that foot again? should i wait until all swelling & pain is gone before doing so

Progress as tolerate: Unless it was a massive tear of your tendon/ligament, you should do weight bearing as tolerated. Don't wait till it's all gone. If you can put weight without excessive pain, then start walking on it carefully. If it hurts alot with normal weighbearing, you might want to use a crutch/cane so you can do partial weightbearing.