diva cup = anxiety attack...?

I have really bad anxiety anyways and it's always doubled when I'm on my period but I recently started using the diva cup.  It seems like a panic attack is manageable until I put in my diva cup and then I go spiraling into a really bad panic attack until I take it out.   I always end up taking it out because I feel almost claustrophobic which is weird but it's the best way to describe it.  I don't understand why it's like this because I can wear tampons just fine but for some reason the full feeling of the cup makes me freak.