I am suffering from anterior tibial tendinitis. Should I quit my job?

Hi doctor,

I am a 25 year old female with no allergies, smoking and drinking. I am suffering from anterior tibial tendinitis. I first began to feel the throbbing pain in my foot a month back. I was told that I have tendinitis. Last two weeks, I have worked for 12 hours a day with no day off was a big contribution for this medical condition. Anterior tibial tendinitis limits my activities by making it hard for me to walk or stand during long periods of time. I did not have any medical tests done. A physical examination of my right foot and ankle was done last week. I received a prescription for an anti-inflammatory pill called Naproxen. I was advised to take this 500 mg pill up to two times a day to help with pain but the pill must be taken before the pain begins. I was also advised to continue wearing supportive shoes, insoles, ankle supports and ice my foot for approximately 20 minutes whenever I feel the pain. I can do other activities that I do not put so much stress and strain on the foot. I was out a total of 3 days because of this condition. I did call my employer and let them know what was going. I also bought to their notice that I would be out for the next 2 days due to this medical condition. I did my research on this medical condition looked up information on the computer about tendinitis. When I looked up this information I was advised to cease the activity which caused tendinitis. I also looked up the short-term and long-term effects of this medical condition. I have documentation to prove that I do have this medical condition. Shall I apply for leave? Or should I quit my job?