Hello,
Thank you for writing to HCM,
Pain during sex is normal thing while having sex. So nothing to worry about it.
Pain should be there if amount of pre cum from vagina is less than normal amount of pre cum.
I had gone through your query and would like to suggest you that
dizziness might because of lots of pain as you described. you should not go for more sex if same feels next time because it might be harmful.
For relief from pain i would like to suggest you that go for foreplay and
Oral sex first before you go for intercourse because it will help for pre cum and also you and your partner will have more pleasure than normal intercourse. And due to enough amount of pre cum your vagina allows penis to enter easily and will not or light pain there.
Also you should go for different positions of sex because that also matters for pain. Use some positions in which penis easily enters in vagina and give you no pain at all.
Still if you had any queries you should go for doctor for more help.
Hope you will find it helpful.
Thanks & Regards,
Dr. Gaurav Prajapati