Dear , This is Dr. S. Tomar from healthcaremagic.com s medical team and I ll be your medical adviser for this question. First of all thank you for sharing your concern with us and showing trust on us. Mononucleosis is a self limiting disease and infection resolves on it s own in 3 to 4 weeks itself without any permanent health disorder . In few cases chronic fatigue can be seen for upto 6 to 8 months which resolves on it s own . Chronic fatigue syndrome can cause similar manifestation as you have described your complaints and should further be evaluated with your Healthcare providers . Other conditions which can cause similar fatigue and pain includes : 1. connective tissue diseases 2.liver diseases 3. kidney diseases 4. anemia 5. heart problems 6. IBD 7. THYROID PROBLEMS 8.Depression I would recommend to consult with your Healthcare providers and rule out any possible condition as mentioned above . With this I would suggest you to exercise regularly and eat a healthy diet . For pain and sleeping problems proper medicines should be prescribed . Be very careful with optisulin . Optisulin is the brand name of 2 different kinds of medicines : 1. insulin glargine for diabetics 2. vitamin supplement. So be careful and never consult friends for medicines , it s highly recommended that any medicine should always be taken on written prescription of your Healthcare providers . For weight reduction , I would suggest you to exercise regularly and take healthy low calorie diet . This will give you a permanent weight reduction . Lifestyle modifications like exercise and good diet should be a part of life . This is my initial response and discussion is open until you have any query or need further clarification. I wish you good health . sincerely, Dr. Shardendu Tomar