Possible concussion dad won’t take me to a hospital?

[Sammy_2004_w]

Ok so please no hate or anything. I’m 14 year old girl and I just got back from a ski trip. Basically what makes me believe I might have a concussion is that 5 days ago we where skiing and I fell on a pretty flat run, I went face first landing on the left side of my face, I was unconscious for 30 seconds. My dad told me some guy offered to call ski patrol which my dad said no to. I slowly got up, I had a pretty bad headache as we where skiing down. When we got to the bottom we went to our hotel, I noticed my head felt really heavy and I could only keep my head straight up. Next day my neck was stiff, I had a small bruise on my forehead, my nose was bruised and a small cut under my eye. I skied that whole day and got a headache in the afternoon. Tuesday I flew home, neck still stiff ,headache after my flight in the evening. Wednesday I wake up headache starts later in the day neck is almost better, Nd today Thursday I woke up with a headache and became nauseous in the evening. I told my dad about my headache and he just says in a stress headache. I’m not sure what to do? I live in Canada so the cost is not a problem and there is a hospital nearby that has a separate walk in clinic. I don’t have a mother so don’t bother. How do I convince my dad I should go? I just want to make sure it’s nothing more serious.
Update:
Here are my symptoms:
Tension like headache behind my eyes and on the side of my head sometimes only in one side which can get stronger or goes away for a but.
Slight nauseous
Trouble falling but once asleep sleeping for 10+ hours which is not normal for me.
Dizziness
Can barely remember before the injury ( that day)
Tired

[EggNoggin]

I hope you went to the hospital even on your own.

[Dragonfly333123]

I know this is from March but did you ever go to the DR? Sounds like you had a concussion.