I'm really pleased you came on here and wrote this - it must have been tough to do so, thank you.
I used to deal with anxiety and found that breathing exercises helped, getting the right diet and going out on long walks. I would also suggest trying to find someone to talk to when you feel stressed - try using childline (UK) 0800 11 11 if you get really stressed or just want a chat.
This link might help
I wish you all the best and you can talk to me anytime.