I Was Stung By A Stingray Over 5 Weeks Ago

I was stung by a stingray over 5 weeks ago I went to life guard and my foot was in Hot as I could stand water for 2 hours I thought I was fine did not go to Dr It is now over 5 weeks and I was in ER two days ago
Today I was back to my GP My problems have been first a lip that would not heal Then pain in my left knee and black and blue knee but I did not bump it! Most painful is the left swollen ankle and excruciating pain! Hard to sleep! I soak the foot in epson salts twice a day and put cold packs on my ankle all day Nothing seems to help! Any suggestions? I feel like an invalid! Thank You!