Reply To: i had been through pseudomonas aeruginosa chest infection, sore throat, uti, gi track issues, weightloss, it all happend all of a sudden. now i am still dealing with cough ,headache, fatigue, muscle weakness, joint pain. went to many docs all of them told me nothing is wrong all tests are normal, yesterday i requested for vitamin d3 test and my vitamin d3 level is 9 ng/ml. i have started taking 5000 ul a day. is this the right dose for me? i am 26yrs old male with no previous illness.