Diziness and fainting. This diziness?

I'm having viral fever from last 3 days. Yesterday night I woke up at 4AM and went to urinate. When urinating I suddenly felt dizzy and fainted. I somehow managed to get up after 5 min and went to hospital. They checked my BP, Blood sugar and found the readings as 110/70 and 71. Doctor asked me to have something sweet and take rest, I did it. Again today morning I faced the same scenario. I woke up at 8AM and while urinating I felt very dizzy. I checked my temperature before getting up from bed today and found it to be 102.7. Both these days, after getting dizzy within 5-10 min I'm heavily sweating. I don't have any traces of BP or Diabetes previously. I'm 23 years old by the way. Tablets that I'm using are 1. Paracetomol 650 for every 6 hours 2. Cefpodoxime Proxetil as antibiotic every morning and night. What could be the reason for this dizziness?