I need serious help!! plz someone!!

[myfamily31]

I recently purchased a touch pro 2. It is a verizon model, I had it flashed to cricket and everything started working fine atleast i thought. Now my phone is telling me that my memory is critically low and my messages dont come in and or send. the apps dont open and i cant turn off the phone.. What can I do to correct this problem? someone please help me.. thank you in advance..