is my iPhone hacked?

Hi guys. Im sorry this is so long but please read! this is getting quite frustrating but my phone is out of space capacity. HOWEVER, it has been like this for the last 2 months and it still has worked fine, and i am able to save pictures by taking them in an app called snapchat and saving them to camera roll. For some reason this works, and I just continued doing this for the last 2 months or so. However, today, i was saving multiple pictures, and my snapchat froze completely. I checked my camera roll and saw a bunch of greyed out pictures as awell as a white picture with the words jpeg. in it. I also saw it said Restoring... at the bottom of my camera roll. I reset my phone and tried to delete a few pictures and it seemed to stop. Then, problems started happening with imsg. Its weird. sometimes my msgs will go through, sometimes they wont. It'll say sending 1 of 2 and when i close the app because it wont send, my msg will vanish and itll return the to last convo i had. Also, when i reset my phone at this time, it deleted all my msgs and randomly on the screen a bunch of notifications came up from 8 hours ago, and all my recent msgs were deleted. Basically imsg is barely working and sending. Then, while on safari I was searching if my phone was hacked and if my snapchat was hacked or what not, and it would suddenly close. When going to websites not regarding hacking it didnt close, and whenever i searched for a particular issue it closed on me. I found this really strange. Also randomly the apple symbol came up and my phone did a quick like 5 second reset, which was really strange. Finally, my mail just simply DOES not work AT all right now. when i click on the icon it crashes completely. and before it started crashing my mail kept getting notifications from like a few days ago and it kept coming in one after another. Now my mail is completely wiped but before it got wiped a huge amount of mail came in from "No sender" and dating back from 2000. Also I sometimes get random vibration sounds on my phone just randomly vibrates and buzzes. This all happened today. Im sorry if its so long, and if you guys have any other questions about what happened I'll answer. Im just worried is it hacked?