Shit Lay down Listen to some music and close your eyes Take your mind off of whatever is makin you stressed out

Just try to calm down and focus on calming things listen to relaxing music and things that will take your mind off the stress.

Take a break or a hot shower/bath if it calms you down something that'll make you forget about your stress

Ok, for your headache try getting an ice pack or a cold compress and apply some pressure to your head. It will take some of the pain away.From then on, try finding some funny videos or something that calms you down on the internet, or you could try drawing something. The headaches are a part of puberty unfortunately, your brain is developing and this is a side effect of that, so try developing a routine that will calm you down whenever this happens. This may take some time, but it will be worth it.