Ear Piercing Troubles!!! Help!!!

I've piercing my ears for nearly 3 months. I pierced it at a very professional (and expensive!!!) ear piercing store, and the price includes 6 check-ups within 3 months. They recommended that i didn't change my earrings until approximately 3 months, so i waited for about 2&1/2 months, and on my 5th visit to the store for the aftercare, one of the staff their changed my earrings for me. I had no problem at all when she changed them. That night, i took my earrings off before i took a shower (for about 20 min) and when i came out, i attempted to put my "starter studs" back in, and i couldn't. I started to freak out, and i asked my parents to try and help me. They couldn't do it without making my ear bleed either. So the next day i went back to the store and a lady helped me to put my earring back in (she sort of poked it gently, and stuff like that) and she succeeded in both my ears.
It has been about 10 days since that happened, and so today (10 min ago) i was just playing around with my earring and i kind of pulled it. the back (so did the earring itself) came out and 2 seconds later i was at the mirror trying to put it back in. The earring went in almost all the way, but it wouldn't go any further. i pushed it hard and so it went it, but my ear bled. It's still in now, but im worried. Why can't i ever seem to put my earrings back in, even when the hole hasn't even been bare (not have an earring in it) for 1 min???
Please help, i'm really worried!!!

xoxo,
Maya