My IPhone 4s is glitching and i do not know how to fix it?

I have had my IPhone 4s for 1 1/2 years now. Its been giving me extreme problems for the past couple of weeks of continuously quitting applications and entering others at random, shutting on and off without me doing it, and a ton of other things. I have reset it a few times, turned it on and off as well as making sure it was completely updated (and it is btw). But today i sent a long txt composed of nothing but emoticons to my friend (it was "revenge" since she did it to me yesterday). After that i exited her convo and through out today was able to txt all my other contacts i interact with. But now tonight when i went to send her a txt and entered the convo my phone's screen went white for a few minutes then the screen went dark. Basically it won't allow me to connect with her contact except for one group message convo that i use to talk to her and a few other friends with. She told me she never received any such message leading me to believe my phone might be acting up due to being convinced that it is still sending the message? I have done everything i can think of to fix this or force quit the sending but it won't! Please help. Do you know what/how to fix my phone? :/

Thank you in advance for any and all helpful responses.

Added (1). Btw i'm going to the Apple store/ AT&T (whichever) tomorrow to get it looked at for its other problems i was just hoping someone could help me fix this one tonight.

Turn it off for about One (1) minute then recycle it. Also, kill any apps that you are not using ( Google how to kill apps on iphone 4s ) by pressing the home screen twice, holding one of the apps until it starts shaking then keep on deleting them.

My iphone 4s is on the screen were it shows the apple but the apple is at the top glitching out and won't fully turn on

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