So migraines or something's more serious?

I am a 16 year old male, a couple month ago ago I started getting slight headaches but would go away. Then 3 weeks ago I got an everlasting headache. First couple days were fine but then I started getting nauseous and then throwing up I got really fearful and went to the dr thinking it was a brain tumor (no family history of cancer) dr told me I was fine it was just anxiety. That was 2 weeks ago. My headaches are still here and only affect one side of my head. I wake up in the morning feeling no headache until I start to think about it then it comes and it's with me the whole day it's either on the left side of much head affecting the temple behind my eye and top of my head. Then same goes for when it's on the right side then follows neausea with it. I know it's probaly not a brain tumor because more serious side effects would be happening. But my anxiety leads me to think it Is then I break down and start crying because I don't want to die at such a young age. I don't want to leave my parents. I also haven't been eating much lately due to not having an appetite and have lost 10lbs. I am 5-10, excersize often, and I did used to smoke but I've quit for a few months now so as far as I know including healthy. This is breaking me down tho and I don't feel the same like I used to and it sucks I have to much to be excited for....

Anxiety is the likely culprit. Insist on an MRI to rule out tumor. This will ease you mind. I find that 2 ibuprofen and a caffeinated soda will swiftly cure most migraines. Try it next time.

Dylan I think you will be ok. It's not a tumor. I'm assuming you have dried eating something or drinking water. If it's caused by anxiety it's just stressing you out man. I get that a lot. Drink lots of water and dry some headache medication. Don't let it get to you. Whenever I get anxious I take deep breaths and try to calm down. I sometimes even use the overthinking as an advantage so I can really figure out all possible reasons why my anxiety is acting up. 

Drink some water and get some sleep you will be okay. 

Alright thank you I will try doing that. And as for the MRI I want to get one but it scares me because what if there is something?? I'd rather just live my life not knowing then knowing. But yea if it continues for a minimum 2 more weeks then I'm going to tell my mom I need one. 

Yea and the thing is... I only start getting nauseous and start feeling sick when I start thinking about it way to much. But when I'm in nice calm environments like taking  shower for example I feel fine and I just get my mind off of it. But when I get out I start thinking about it again then it all comes back. This absolutely sucks man. Not once in my life if being sick have I had a problem with this. But I also think I'm really worked up about it because one of my moms friends son that I used to hang out with just got diagnosed with a brain tumor he's only 13 and I feel so bad for him. So I think that may be playing a part to.