see most likely a dengue
causing this. Fever
has settled down. so that's a good thing.
sometimes in dengue playlets do keep fluctuating like this.
so current scenario of 40,000 platelets do not look so good.
but again the actual prognostication is done on te conditions of the patient.
are there any bleeding manifestations?
it would be great if your doctor can examine you closely and look for any petechia etc to decide the treatment line eg: platelet transfusion etc.