Diziness while I stand. Health problem?

I am feeling dizzy (non spinning) since 10 days.Some acid reflux. Consulted GP she gave vertin 8mg,ome-d,multivitamin syrup,that didn't worked.Also she gave multivitamin,electrolyte saline.that also didn't worked.Then consulted ENT specialist cause I have ruptured eardrum from past 2 years.He suggested surgery we agreed to do it after exams so till then he gave medications kobadex,dosa-jsr,kefex,sino-plus so after 4-5 days my dizziness got reduced but I started feeling blackness while I stand suddenly and non painful muscle spasms whole body mostly limbs ,it was not happening before medications.I told him this in second visit then he gave evion,sino-plus 500,uprise d3 60k,rabwin-d but still feeling blackness after stand,and muscle spasms and dizziness no effect of tablets and also very very light palm shakiness while I hold phone.Should I consult NEUROLOGIST ,or should I again go to the ENT and tell him about the same?I am getting anxiety,Do I have a serious health problem?