Felling of diziness while try to feel.

Doctor, I'm 15 years old, weight 100 KG. 4-5 months ago, I suddenly started to feel dizzy and it continues almost 5-7 days. Then I started to take (Cinnarizine 20 MG) for 15 days and it stopped. After two days of stopping medicine, it appears again and then doctor prescribed (Betahistine Dihydrochloride 8 MG) for 15 days. After taking this medications, my dizziness stopped. But, since then, whenever I try to fell that I'm feeling dizzy, I think that I really started to fell dizzy and this dizziness stay near about 10-30 minutes and then disappear it's own. I have no other physical problem. Please note that I'm suffering from health anxiety for upto a year. What's going on, doctor? Is it something serious? Please help, Doctor.