You have written a query with good spellings. Thanks for that.
Coming straight to your answer:
In my view, there is something wrong in you. It is not possible that nothing is wrong with you and you have these many problems.
Yes, blood pressure and dizziness
are related to each other. When you have low blood pressure, you tend to feel dizzy.
If I were your treating doctor, I would put you on combined hormonal
pills to regularize your cycles, and even to make them once a month frequency. This would continue for a few months and then I would evaluate you further.
You also seem to have Pelvic Inflammatory Disease
(PID) in view of the pain in the groin and cramps.
Feeling needles and pins after sexual intercourse is unusual. You probably have a pinched nerve
in your hipbone region.
I hope this gives a brief description of which way you should head regarding your health concerns.
Wish you good health.