If you have used a tampon of the right size, and if it is sterile, it cannot be the cause of the symptoms. The dizziness
are likely to be a consequence of the pain. The cramps are likely to be uterine. Please see your consultant for a proper assessment and further management if they do not subside with simple anti-spasmodic medication. Use of tampons can lead to local infection and hence should be used with caution and also with the precaution not to retain them for longer hours. Hope this helps.