I had dengue fever, feel numbness, losing my vision, broke into cold sweat?

22-female, had dengue at 20. No medications. Few days ago, while standing for about 10minutes, i suddenly felt numbness on my neck up to my head and then as time passes by i am losing my vision little by little and replaced by something like blurry black rain instead, when the vision left was only about 5-10%, i decided to sit and drink water. After few minutes i broke into cold sweat and little by little my vision came back but the stiffness in my neck was still there. Does this normally happen? If not, what could possibly be wrong with me?

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