Stressed out when driving

Ok, I need advice! I’m a new driver, I got my license in December but only started driving mid-may. Lately, I’ve been doing long trips (2 hours) with my boyfriend to go see his family. The problem is, whenever I start driving, I get a headache at least 30 min-45 mins after I’ve started driving whether it’s from our place to his parents and vice-versa. At the beginning, I thought that it was because I was driving at night and maybe because of my boyfriend, but then I drove in daylight at 2pm and I still got a headache after 30 minutes. Even driving alone made me have a headache. I don’t know if any of you have had a similar problem that you could help me with because I am tired of having headaches when driving long routes and I won’t be able to driving longer ones if I need to.

Thank you