Hello and welcome to HCM.
Thank you for your query.
Tampons are designed in such a way that they absorb all the shedding and blood that is expelled during a period. This would result in the tampon swelling up, which would have made it bigger in size than it was when it was inserted, so finding it difficult to take out, is normal.
The
dizziness could just be a symptom of your period, many women experience weakness, light headedness, etc; during their period, this might not be related to tampon use.
Yes, you can use the tampon on the last day of your period, but swimming with the tampon would lead to the tampon getting soaked with the water, making it less effective in soaking the blood and shedding from the period. You could swim without the tampon if you wish to do so, as this would be the last day of your period, and discharge would be minimal or absent. Even more, as you would be in a beach, no one would be able to notice the discharge, even if it occurs.
No ma'am, there are no such risks of swimming without a tampon during your period.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://doctor.healthcaremagic.com/doctors/dr-shoaib-khan/64581I would gladly help you.
Best wishes.