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You have suffered dengue fever
,it is good that you have recovered well.
In case of Dengue we are always worried about platelet count
but as you have done count it is 2.58 lac.
has seen rest assured this is nothing serious and as he told could be Post voral rash and will go away and it to much itching is there can take prescribed medicines(Antihistaminics).
How ever there is one more possibility the drugs which you have taken for dengue may be antibiotics or Analgesic
may cause drug allergy?
By this time you get this answer I hope your rash must have subsided .
Just take normal diet any vitamins prescribed by your doctor.
Have faith in your treating Physician ,you will improve in few days .