I would try it anyway.
1. Clearflash clears your flash/cache memory and not your internal memory.
2. I think it won't hurt your device as more as it is now.
It looks like you are having a problem with your internal memory.
Is it possible to access the device from a PC without a SD card in it?
If so you could format the internal memory to see if that works.
By the way, what are the first 2 digits of the serial number of your device? You can find that mostly at the bottom of you device.
In my , you can find some details about you device. For instance how big the internal memory is.
Peter