First of all you don't have to shout and ask something like a 2 years old children or like someone stole something for you. One the other hand this is an aftermarket firmware and it's provided WITHOUT WARANTY and nobody forces you to install it. Now let's focus on your "problem". I've almost forget: you don't need to tell that you have and microHCSD 32gb card with an awesome speed of read/write because i think nobody gives a s***t on that information ( it's ok to say that you have and memory card/external card ). For making things lot easier because i think you're noob ( don't understand me wrong ), i suggest you to install " OI File Manager " because have an simple and clean UI (User Interface), even it is not the best file manager ( personally i use this for simpe things ).After you've installed this reboot the phone, open it, i mean OI File Manager ( you'll need to press accept i think ), then you'll see some files like: Alarms, Android,Download,etc. On the top of the screen, in the left corner you''ll see "storage", press on it, then you'll see 3 folders: sdcard0 (which represents internal memory ), sdcard1 ( which represents you memory card microHCSD) and usbdisk ( for USB OTG). The next step is to select sdcard0 and to search in all folders and if you haven't found your photos/videos/memories , go again to storage, select sdcard1 and search again in all folders. If you haven't found that means you've done an format /sdcard or format /external or something like that from recovery, or from settings-> storage you erased them , or manually you erased them . Next time don't be angry and frustrated beacause it's NOT OUR FAULT. Sorry for my english. I whish you luck in finding !
Edit: Next time you can make an backup of your personal data...just in case